Background
He was born in 1374, the son of Sir William Bourchier (d1375), (the younger son of Robert Bourchier, 1st Baron Bourchier (d1349), of Halstead, Essex, Lord Chancellor) by his wife Eleanor de Louvain (27 March 1345 – 5 October 1397), daughter and heiress of Sir John de Louvain (d1347) (alias Lovayne etc), feudal baron of Little Easton in Essex. The arms of Louvain were: Gules billety or a fess of the last, often shown with varying number of billets and on occasion with a fess argent, for example in stained glass at Hengrave Hall, Suffolk: Gules, a fess argent, between fourteen billets or. Eleanor was descended from Godfrey de Louvain (d1226), feudal baron of Little Easton, son of Godfrey III, Count of Louvain (1142-1190), by his 2nd marriage, and half-brother of Henry I, Duke of Brabant (1165-1235).
His inheritance from his mother"s Louvain lands included the Suffolk manors of Bildeston, Hopton, Shelland and "Lovaynes" in Drinkstone, and in Essex Little Easton, Broxted and Aythorpe Roding.