The interpretation timeline
Jonah 3:5 Douay-Rheims

And the men of Ninive believed in God: and they proclaimed a fast, and put on sackcloth from the greatest to the least.

A.D. 99 – 1875 11 witnesses

Patristic

before A.D. 750
99
A.D.
Clement of Rome Patristic
d. A.D. 99
“Let us turn to every age that has passed, and learn that, from generation to generation, the Lord has granted a place of repentance to all such as would be converted unto Him... Jonah proclaimed destruction to the Ninevites; but they, repenting of their sins, propitiated God by prayer, and obtained salvation, although they were aliens [to the covenant] of God.”
Source
389
A.D.
A.D. 329–390
“Let us sow in tears, so that we may reap in joy. Let us show ourselves people of Nineveh, not of Sodom. Let us amend our wickedness, lest we be consumed with it. Let us listen to the preaching of Jonah, lest we be overwhelmed by fire and brimstone. And if we have departed from Sodom, let us escape to the mountain. Let us flee to Zoar. Let us enter it as the sun rises. Let us not stay in all the plain. Let us not look around us, lest we be frozen into a pillar of salt, a really immoral pillar, to accuse the soul that returns to wickedness.”
Source
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“If what the Apostle has said is not enough, let them hear the Prophet saying, I chastened myself with fasting. He therefore who fasts not is uncovered and naked and exposed to wounds. And if Adam had clothed himself with fasting he would not have been found to be naked. Nineveh delivered itself from death by fasting. And the Lord Himself says, This kind goeth not out but by prayer and fasting.”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Do you see how vexed God is when fasting is treated despitefully? Learn how delighted he is when fasting is honored. When Eve was maltreated, he inflicted death as a penalty upon the insolent individual. He revoked death when she was honored once again. Desiring to show you the power of this thing of importance, he gave her authority over the sentence, after the arrest, to snatch the prisoners from the middle of the journey and change their course toward life. And he did this not only for two or three or twenty people but also for a whole population, in the case of the great and marvelous city of the Ninevites, which had knelt and bowed its head over this pit of perdition and was expecting to suffer the blow from above. Like a heavenly power overseeing Nineveh's charge, fasting snatched the city from these gates of death and returned Nineveh to life.”
Source
date
unknown
c. A.D. 550
“But the Chaldaeans and the Medes and Persians, having a somewhat wider knowledge, were instructed by the building of the Tower, and the deluge, and by what happened in the case of Hezekiah and Jonah, and by the Captivity, and by Daniel and the Three Children, and also partly by the writings themselves. In like manner also the Egyptians were instructed by the affairs of Joseph and of Moses, and by the people of Israel, and these nations were thus better prepared for a ready acceptance of Christianity.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“So the people of Nineveh believed God,.... Or "in God" (r): in the word of the Lord, as the Targum; they believed there was a God, and that he, in whose name Jonah came, was the true God; they believed the word the prophet spake was not the word of man, but, the word of God; faith came by hearing the word, which is the spring of true repentance, and the root of all good works. Kimchi and R. Jeshuah, in Aben Ezra, suppose that the men of the ship, in which Jonah had been, were at Nineveh; and these testified that they had cast him into the sea, and declared the whole affair concerning him; and this served greatly to engage their attention to him, and believe what he said: but this is not certain; and, besides, their faith was the effect of the divine power that went along with the preaching of Jonah, and not owing to the persuasion of men; and proclaimed a fast; not of themselves, but by the order of their king, as follows; though Kimchi thinks this was before that: and put on sackcloth, from the greatest of them even to the least of them; both, with respect to rank and age, so universal were their fasting and mourning; in token of which they stripped themselves of their common and rich apparel, and clothed themselves with sackcloth; as was usual in extraordinary cases of mourning, not only with the Jews, but other nations. (Jonah would be a quite a sight to behold. The digestive juices of the fish would have turned his skin to a most unnatural colour and his hair was most like all gone. Indeed, anyone looking like that would attract your attention and give his message more credence, especially after he told you what had happened to him. A God who creates storms, prepares large fish to swallow a man and preserves him in the fish, would not likely have too much trouble destroying your city. Editor) (r) "in Deum", V. L.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“The people of Nineveh believed God - They had no doubt that the threatening would be fulfilled, unless their speedy conversion prevented it; but, though not expressed, they knew that the threatening was conditional. "The promises and threatenings of God, which are merely personal, either to any particular man or number of men, are always conditional, because the wisdom of God hath thought fit to make these depend on the behavior of men." - Dr. S. Clarke's Sermons, vol. i. Proclaimed a fast - And never was there one so general, so deep, and so effectual. Men and women, old and young, high and low, and even the cattle themselves, all kept such a fast as the total abstinence from food implies.”
Source
1849
A.D.
1774–1849
“God. They were convinced that he had wrought such wonders in the person of Jonas, with a desire of their welfare, particularly as he allowed them some delay. Accordingly they did penance for about forty days, and their conversion was so sincere, that Christ proposes it to his disciples, Matthew xii. 41. (Calmet) — Thus “the city was overturned in its perverse manners.” (St. Augustine, City of God xxi. 24., and Psalm l.) — They were at an end, and the city was renovated. (Haydock)”
Source
1863
A.D.
1871
A.D.
1871
“believed God--gave credit to Jonah's message from God; thus recognizing Jehovah as the true God. fast . . . sackcloth--In the East outward actions are often used as symbolical expressions of inward feelings. So fasting and clothing in sackcloth were customary in humiliation. Compare in Ahab's case, parallel to that of Nineveh, both receiving a respite on penitence (; ; ). from the greatest . . . to the least--The penitence was not partial, but pervading all classes.”
Source
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“The Ninevites believed in God, since they hearkened to the preaching of the prophet sent to them by God, and humbled themselves before God with repentance. They proclaimed a fast, and put on sackcloth (penitential garments: see at Joe 1:13-14; Kg1 21:27, etc.), "from their great one even to their small one," i.e., both old and young, all without exception. Even the king, when the matter (had-dâbhâr) came to his knowledge, i.e., when he was informed of Jonah's coming, and of his threatening prediction, descended from his throne, laid aside his royal robe ('addereth, see at Jos 7:21), wrapt himself in a sackcloth, and sat down in ashes, as a sign of the deepest mourning (compare Job 2:8), and by a royal edict appointed a general fast for man and beast. ויּזעק, he caused to be proclaimed. ויּאמר, and said, viz., through his heralds. מפּעם הם, ex decreto, by command of the king and his great men, i.e., his ministers (פעם = פעם, Dan 3:10, Dan 3:29, a technical term for the edicts of the Assyrian and Babylonian kings). "Man and beast (viz., oxen and sheep) are to taste nothing; they are not to pasture (the cattle are not to be driven to the pasture), and are to drink no water." אל, for which we should expect לא, may be explained from the fact that the command is communicated directly. Moreover, man and beast are to be covered with mourning clothes, and cry to God bechozqâh, i.e., strongly, mightily, and to turn every one from his evil ways: so "will God perhaps (מי יודע) turn and repent (yâshūbh venicham, as in Joe 2:14), and desist from the fierceness of His anger (cf. Exo 32:12), that we perish not." This verse (Jon 3:9) also belongs to the king's edict. The powerful impression made upon the Ninevites by Jonah's preaching, so that the whole city repented in sackcloth and ashes, is quite intelligible, if we simply bear in mind the great susceptibility of Oriental races to emotion, the awe of one Supreme Being which is peculiar to all the heathen religions of Asia, and the great esteem in which soothsaying and oracles were held in Assyria from the very earliest times (vid., Cicero, de divinat. i. 1); and if we also take into calculation the circumstance that the appearance of a foreigner, who, without any conceivable personal interest, and with the most fearless boldness, disclosed to the great royal city its godless ways, and announced its destruction within a very short period with the confidence so characteristic of the God-sent prophets, could not fail to make a powerful impression upon the minds of the people, which would be all the stronger if the report of the miraculous working of the prophets of Israel had penetrated to Nineveh. There is just as little to surprise us in the circumstance that the signs of mourning among the Ninevites resemble in most respects the forms of penitential mourning current among the Israelites, since these outward signs of mourning are for the most part the common human expressions of deep sorrow of heart, and are found in the same or similar forms among all the nations of antiquity (see the numerous proofs of this which are collected in Winer's Real-wrterbuch, art. Trauer; and in Herzog's Cyclopaedia). Ezekiel (Eze 26:16) depicts the mourning of the Tyrian princes over the ruin of their capital in just the same manner in which that of the king of Nineveh is described here in Jon 3:6, except that, instead of sackcloth, he mentions trembling as that with which they wrap themselves round. The garment of haircloth (saq) worn as mourning costume reaches as far back as the patriarchal age (cf. Gen 37:34; Job 16:15). Even the one feature which is peculiar to the mourning of Nineveh - namely, that the cattle also have to take part in the mourning - is attested by Herodotus (9:24) as an Asiatic custom. (Note: Herodotus relates that the Persians, when mourning for their general, Masistios, who had fallen in the battle at Platea, shaved off the hair from their horses, and adds, "Thus did the barbarians, in their way, mourn for the deceased Masistios." Plutarch relates the same thing (Aristid. 14 fin. Compare Brissonius, de regno Pers. princip. ii. p. 206; and Periz. ad Aeliani Var. hist. vii. 8). The objection made to this by Hitzig - namely, that the mourning of the cattle in our book is not analogous to the case recorded by Herodotus, because the former was an expression of repentance - has no force whatever, for the simple reason that in all nations the outward signs of penitential mourning are the same as those of mourning for the dead.) This custom originated in the idea that there is a biotic rapport between man and the larger domestic animals, such as oxen, sheep, and goats, which are his living property. It is only to these animals that there is any reference here, and not to "horses, asses, and camels, which were decorated at other times with costly coverings," as Marck, Rosenmller, and others erroneously assume. Moreover, this was not done "with the intention of impelling the men to shed hotter tears through the lowing and groaning of the cattle" (Theodoret); or "to set before them as in a mirror, through the sufferings of the innocent brutes, their own great guilt" (Chald.); but it was a manifestation of the thought, that just as the animals which live with man are drawn into fellowship with his sin, so their sufferings might also help to appease the wrath of God. And although this thought might not be free from superstition, there lay at the foundation of it this deep truth, that the irrational creature is made subject to vanity on account of man's sins, and sighs along with man for liberation from the bondage of corruption (Rom 8:19.). We cannot therefore take the words "cry mightily unto God" as referring only to the men, as many commentators have done, in opposition to the context; but must regard "man and beast" as the subject of this clause also, since the thought that even the beasts cry to or call upon God in distress has its scriptural warrant in Joe 1:20.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.