Armyne’s family had held manorial property in Lincolnshire since 1330, and represented the county in 1382 and 1385. His religious preferences can be gauged from the two prominent puritan clergymen, Tempest Wood and Hugh Tuke, whom he presented to livings. Tuke was tutor to Armyne’s second son, and was protected by him against episcopal discipline for refusing to wear the surplice or to baptize with the sign of the cross.
Armyne had represented Grantham in 1589, and probably stood again in 1620 at the instance of his ambitious son, already a baronet, who joined him as MP for Boston. Either Armyne or his son spoke on 23 Feb. 1621 in the debate on the contempt committed by Sir Francis Michell, one of the patentees for alehouses.
