The Feast of the Chair of St. Peter is a commemoration of the contributions of the Apostle to the Christian Church. It celebrates his authority and endless efforts to build a strong community around the teachings of Christ and has been celebrated since the earliest times in the Christian era.
St. Peter was known to hold the keys to the kingdom of heaven, entrusted to him by Jesus himself. For this and many other reasons, St. Peter became a celebrated figure in Christianity.