On 5 November 1562 the churchwardens were ordered to break, or cause to be broken, in two parts all the altar stones in the church. Coverdale, an anti-vestiarian, was Rector at the peak of the vestments controversy. In March 1566 Archbishop Parker caused great consternation among many clergy by his edicts prescribing what was to be worn and by his summoning the London clergy to Lambeth to require their compliance. Coverdale excused himself from attending. Stow records that a non-conforming Scot who normally preached at St Magnus twice a day precipitated a fight on Palm Sunday 1566 at Little All Hallows in Thames Street with his preaching against vestments. Coverdale's resignation from St Magnus in summer 1566 may have been associated with these events. Separatist congregations started to emerge after 1566 and the first such, who called themselves 'Puritans' or 'Unspottyd Lambs of the Lord', was discovered close to St Magnus at Plumbers' Hall in Thames Street on 19 June 1567.