The link between Empire and Christianity has a durable legacy: to this day, Rome remains the seat of the Catholic Church, and Constantinople (Istanbul) that of the Ecumenical Patriarchate with a widely recognized status of "primus inter pares" within the Eastern Orthodox Church. (In 2018, the negotiations over autocephaly of the Orthodox Church of Ukraine led to a schism between Moscow and Constantinople as the Russian Orthodox Church unilaterally severed full communion with the Ecumenical Patriarchate. A similar schism had occurred in 1996 over the Estonian Apostolic Orthodox Church, but unlike in 2018 it was resolved after a few months.)