If you control a Christian, especially around the year 0000, it’s not rare for the Pope to begin calling Great Holy Wars. If you were to control a Powerful Ruler, joining them should set the tides of battle in your favour, unlocking this achievement.
If you control a Christian, especially around the year 0000, it's not rare for the Pope to begin calling Great Holy Wars. If you were to control a Powerful Ruler, joining them should set the tides of battle in your favor, unlocking this achievement.