Vacant Vatican

What is the longest that the See has been vacant in the 2000 year history of the Church, you may ask? There have been FOUR extended interregnums that lasted over a year, with all four lasting over TWO years in fact, with the longest being two years and ten months.

From Clement IV to Gregory X:
The See was vacant from 29 November ARSH 1268 until 1 September ARSH 1271.
2 years 10 months

From Nicholas IV to Celestine V
The See was vacant from 4 April ARSH 1292 until 5 July 1294.
2 years 3 months

From Clement V to John XXII
The See was vacant from 20 April ARSH 1314 until 2 August 1316.
2 years 3 months

From Gregory XII to Martin V
The See was vacant from 4 July 1415 until 11 November 1417.
2 years 5 months

https://www.barnhardt.biz/2023/01/04/frequently-asked-questions-on-the-current-interregnum/

January 4, 2023