Zialonyja sviatki (Зялёныя Святкі, Green week) is an Belarusian fertility festival celebrated in early June and closely linked with the cult of the dead and the spring agricultural rites. It usually fell upon the Thursday of the Green Week (better known as Trinity Week in Russia and the Whitsuntide week in Britain). The end of Zialonyja sviatki inaugurated the celebrations of the Trinity Sunday.