Before the Second Lateran Council in 1139 established mandatory celibacy for popes and clergy, several early church leaders were wed or had offspring. In fact, a number of popes entered priesthood while already married, with at least 15 known to have fathered children. Among these married pontiffs, the list includes the very first pope, St. Peter, along with St. Felix III (reigned 483-492) and St. Hormisdas (514-523), as well as St. Agatho (678-681), Adrian II (867-872), John XVII (1003), and Clement IV (1265-1268).

Even before the landmark council, church regulations on personal lives were evolving. The 306 decree from the Council of Elvira warned that a priest who shares a bed with his wife the night before would be defrocked, while the 325 Council of Nicaea prohibited priests from living with unmarried women. By 385, popes were barred from sleeping with their wives. In 1045, Benedict IX—who served the papacy multiple times—stepped down, reportedly to marry, though his tumultuous tenure and the later sale of the office to his godfather add complexity to the narrative.

Additionally, several popes fathered children outside wedlock, including Leo XII, Clement VII, and Innocent VIII, the latter being the first to publicly acknowledge such paternity. These historical notes illustrate a long arc from personal conduct debates toward the stricter celibacy norms that would eventually be codified centuries later.