Bartholomew I is considered the first among equals among the leaders of the Eastern Orthodox churches.

Source: https://federalnewsnetwork.com/world-news/2023/04/ukraine-asks-court-to-put-orthodox-leader-under-house-arrest/

Easter Sunday, which marks the end of Holy Week, falls April 9 for most Christians -- or April 16 for the Eastern Orthodox church.

Source: https://www.dailyherald.com/news/20230322/ramadan-begins-as-muslims-flock-to-suburban-mosques-for-nightly-prayers-and-observe-daily-fasting

Francis still took part in the two audiences: the first with young priests and monks from Eastern Orthodox Churches and the second with a delegation from the German NGO and non-profit Max Planck Society for the Advancement of Science.

Source: https://www.ncregister.com/cna/vatican-pope-francis-has-strong-cold

The strikes on Kramatorsk were among several missile attacks Russia launched right after the end of President Vladimir Putin's purported unilateral 36-hour ceasefire from Friday through midnight Saturday, to celebrate the Eastern Orthodox Christmas.

Source: https://theweek.com/russo-ukrainian-war/1019909/ukraine-russian-and-western-war-reporters-dismiss-kremlin-claim-of