Resident in the parish of St. Margaret’s, Westminster by 1580, Heywood has sometimes been confused with his nephew and namesake, who lived there in the 1630s.
As a member of St. Margaret’s vestry and a city burgess, it is not surprising that Heywood was elected to Parliament for Westminster in 1626. He may also have enjoyed the backing of his landlord, the dean of Westminster, as his sole committee appointment, to consider a bill to prohibit clergymen from being magistrates (10 Mar.), was amended in committee to allow exemptions for deans, among others.
Heywood was an active Westminster magistrate, who frequently used his position to fine swearers and drunkards.
On 21 Nov. 1640, while in Westminster Hall, he was stabbed in the side with a rusty dagger by a Catholic named John James as he was showing a friend ‘a schedule of such suspected and notorious papists as were about Westminster’ which he had prepared on Parliament’s instructions.
