William Walsh was a Prebendary of St Paul's Cathedral, Bishop of Mauritius and Dover. At the end of his life he was Archdeacon of Canterbury. While he was Bishop of Mauritius, the island experienced one of its worst cyclones; in consequence his cathedral had to be used temporarily as a hospital.

The Bishop of Dover is an episcopal title used by a suffragan bishop of the Church of England Diocese of Canterbury, England. The title takes its name after the town of Dover in Kent. The Bishop of Dover holds the additional title of "Bishop in Canterbury" and is empowered to act almost as if the Bishop of Dover were the diocesan bishop of Canterbury, since the actual diocesan bishop is based at Lambeth Palace in London, and thus is frequently away from the diocese, fulfilling national and international duties. Among other things, this gives the Bishop of Dover an ex officio seat in the church's General Synod. There is another suffragan, the Bishop of Maidstone, who has different responsibilities.