LR1b - Westminster City Archives - Parish Register for the Parish of St Martin in the Fields, 1 January 1582

Register of births, deaths, and marriages for the Parish of St Martin in the Fields   , entry for the baptism of John Brett (possibly Jonson 's stepbrother?), 1 January 1582 .
Eugene Giddens

Baptismus 1581
[Trans.: Baptisms 1581] ... Januarii
1 Baptizatus fuit Johannes Brett
[Trans.: On 1 Jan. John Brett was baptised]

Bibliography
Mason, St Martin in the Fields

St Martin in the Fields was established in the thirteenth century in the 'fields' between Westminster and the City of London . Today it is in Trafalgar Square. It was rebuilt, and its boundaries extended, by Henry VIII c . 1542, and enlarged again in 1607 at the charge of Henry , Prince of Wales . The present church was built 1721-26.