Beginning in 1689, Leisler led an insurrection and seized control of the city by taking over Fort James at the lower end of Manhattan. He took over control of the entire province, appointing himself as acting Lieutenant Governor of the Province of New York, which he retained until March 1691, refusing to yield power until the newly appointed governor himself finally arrived. While Leisler claimed to have acted to support the Protestant accession against Jacobite officeholders in New York, he was arrested by the newly appointed governor of New York in March 1691. With opponents active against him, he was condemned and executed in New York City for treason against the English monarchs William III and Mary II. His estate was forfeited to the Crown.