In 1972, Shimun decided to step down as patriarch, and the following year he got married, in contravention to longstanding church custom. This led to a synod in 1973 in which further reforms were introduced, the most significant of which included the permanent abolition of hereditary succession — a practice introduced in the middle of the fifteenth century by Patriarch Shemʿon IV Basidi (who had died in 1497) — and it was also decided that Shimun should be reinstated. The second matter was supposed to be settled at another synod in 1975; however, Shimun was assassinated by an estranged relative before this could take place.