The interpretation timeline

The First Lateran Council

Ended lay investiture with ring and crosier, and legislated on church discipline.

1123 Rome, the Lateran
Convoked under
Pope Callistus II
Present
about 900 bishops and abbots
What it did
abolished the right claimed by lay princes of investiture with ring and crosier to ecclesiastical benefices; dealt with church discipline and the recovery of the Holy Land
Note
the first council held at Rome

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

Scholastic

c. 1100 – 1500
1123
Event
The First Lateran Council

Lateran I ends lay investiture with ring and crosier — the first council held at Rome.

1123
A.D.
“Canon 1. Following the example of the holy Fathers, and renewing what the duty of our office requires, we forbid absolutely, by the authority of the Apostolic See, that anyone be ordained or promoted for money in the Church of God. If anyone has obtained ordination or promotion in the Church in such a way, let him lose his rank altogether. Canon 3. We wholly forbid priests, deacons and subdeacons the company of concubines and wives, and cohabitation with any other women, save those whom the Council of Nicaea permitted to dwell with them for reasons of necessity alone — namely a mother, a sister, a paternal aunt, a maternal aunt, or others of that kind.”
Can. 1. Sanctorum Patrum exempla sequentes et officii nostri debito innovantes, ordinari quemquam per pecuniam in Ecclesia Dei vel promoveri, auctoritate Sedis Apostolicae modis omnibus prohibemus Si quis vero in Ecclesia ordinationem vel promotionem taliter acquisierit, prorsus careat dignitate. Can. 3. Presbyteris, diaconibus vel subdiaconibus concubinarum et uxorum contubernia penitus interdicimus et aliarum mulierum cohabitationem, praeter quas Synodus Nicaena propter solas necessitudinum causas habitare permisit, videlicet matrem sororem, amitam, vel materteram, aut alias huiusmodi
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.