Byrd, a younger son of a modest gentry family, proved himself a precocious scholar at Oxford, where he proceeded to the rank of doctor of Civil Law and advocate.
In 1611 Byrd joined Sir John Bennet* as a judge of the Prerogative Court of Canterbury, and in 1617 he succeeded Dunne as dean of the Arches, although (Sir) George Newman* had a patent for the reversion.
