From the National Churches Trust:

'The first mention of a chapel in the records of the Inn is in 1428. A model for a new chapel was submitted by Inigo Jones in 1618. The poet John Donne, who was preacher of the Inn at this time, and later became Dean of St Pauls, laid the foundation stone in 1620. The chapel was consecrated on Ascension Day 1623 by the Bishop of London, the Right Revd George Montaigne. John Donne preached 'a right rare and learned sermon'.'