Arsenius of Elassona was a 16th-century Greek clergyman who became a prominent figure in the Russian Orthodox Church. Born in Thessaly around 1550, he rose through the monastic ranks to serve as the Archbishop of Elassona and later held high ecclesiastical positions in Russia, including Archbishop of Suzdal and Tarus. He played a significant role during the Time of Troubles, participating in the election of the first Romanov tsar. His historical writings provide valuable insights into the establishment of the Moscow Patriarchate and the political upheavals of his era.