The interpretation timeline

The Second Lateran Council

Acted against the errors of Arnold of Brescia.

1139 Rome, the Lateran
Convoked under
Pope Innocent II, with the Emperor Conrad
Present
about 1,000 prelates
What it did
put an end to the errors of Arnold of Brescia

These facts as given by the Catholic Encyclopedia (1913), "Councils" PD

Scholastic

c. 1100 – 1500
1139
A.D.
“Canon 2. If anyone has obtained by money — the accursed heat of avarice intervening — a prebend, or a priorship, or a deanery, or any ecclesiastical honour or promotion, or any ecclesiastical sacrament whatever, such as chrism or holy oil or the consecration of altars or of churches, let him lose the honour thus ill gotten; and let the buyer, the seller and the go-between be struck with the mark of infamy. And let nothing be demanded of anyone by anybody, either beforehand or afterwards, whether for a meal or under pretext of any custom, nor let him presume to give anything, since that is simoniacal; but let him enjoy freely and without any diminution the dignity and benefice conferred upon him.”
Can. 2. Si quis praebendam, vel prioratum, seu decanatum aut honorem vel promotionem aliquam ecclesiasticam, seu quodlibet sacramentum ecclesiasticum, utpote chrisma vel oleum sanctum, consecrationes altarium vel ecclesiarum, interveniente exsecrabili ardore avaritiae per pecuniam acquisivit honore male acquisito careat, et emptor atque venditor et interventor nota infamiae percellantur. Et nec pro pastu, nec sub obtentu alicuius consuetudinis ante vel post a quoquam aliquid exigatur, vel ipse dare praesumat: quoniam simoniacum est; sed libere et absque imminutione aliqua, collata sibi dignitate atque beneficio perfruatur
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.