The Episcopal Church originates from the Church of England, which had its official start in 597 when St. Augustine of Canterbury was sent by Pope Gregory the Great to be a missionary bishop to the English. During the 16th century Protestant Reformation, the Church of England split from the Church of Rome, forming what would eventually become a global presence known as the Anglican Communion. The Episcopal Church is part of this global communion, but has dioceses of its own in other countries as well, as it seeks to continue its missionary calling throughout the world.

You may find more on the history and state of the Episcopal Church posted on their website.