Game concept
Convert Faith in County
The game also links it as Convert, Converted, Converting.
From the game's encyclopedia
A Councillor Task performed by the Court Chaplain which targets a County of a different Faith — or one of the same Faith but a different Rite — than the Liege.
Progress increases each month, and at 100% the majority of the Target County adopts the Court Chaplain's Faith. The new Rite follows the Liege whenever the resulting Faith matches the Liege's — otherwise it is the Chaplain's own Rite.
Conversion speed is affected by many factors, including the Councillor's Learning Skill and the Fervor of the involved Faiths. A Chaplain whose Rite differs from the Liege's converts more slowly.
On a Rite-only shift, Fervor favours the mainline Rite above 50% and non-mainline (including heretical) Rites below it.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Convert Faith in County is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Councillor Task performed by the Court Chaplain which targets a County of a different Faith — or one of the same Faith but a different Rite — than the Liege." It is part of Councillor Task. The game also links it as Convert, Converted and Converting. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.