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Peter Ainslie

Peter Ainslie III (1867–1934) was an American preacher and minister in the Christian Church (Disciples of Christ), renowned for his pioneering leadership in the ecumenical movement. Born on June 3, 1867, in Dunnsville, Virginia, he was the son and grandson of Disciples ministers, inheriting a legacy of faith. In 1886, he enrolled at the College of the Bible (now Lexington Theological Seminary) and Transylvania College in Lexington, Kentucky, studying under John W. McGarvey, but left in 1889 due to poor health. He began his ministry supplying the pulpit at a church in Newport News, Virginia, before being called in 1891 to pastor Calhoun Christian Church in Baltimore, Maryland, later renamed Christian Temple, where he served for over 40 years. In 1925, he married Mary Elizabeth Weisel, a Christian educator, and they had two children, Mary Elizabeth and Peter IV. Ainslie’s preaching career was defined by his passionate advocacy for Christian unity, social justice, and world peace. In 1910, as president of the Disciples’ National Convention in Topeka, Kansas, he delivered a landmark address, “Our Fellowship and the Task,” urging the Disciples to reclaim their ecumenical calling, leading to the creation of the Council on Christian Union (later the Council on Christian Unity) with Ainslie as its first president, a role he held until 1924. His ministry at Christian Temple became a beacon for racial inclusiveness and dialogue between Jews and Christians, reflecting his shift from conservative roots to a liberal theological stance. A prolific writer, he authored 15 books, including The Scandal of Christianity, and edited the Christian Union Quarterly. Ainslie died of cancer on February 23, 1934, in Baltimore, leaving a legacy as a “flaming apostle of Christian Unity,” honored by figures like John R. Mott as a key contributor to the modern ecumenical movement.