- dated his reign from 21st August 1485, the day before the Battle of Bosworth, so any Yorkist fighters could be treated as traitors -publicly rewarded his key supported, e.g. by conferring 11 knighthoods-January 1486 Henry married Elizabeth of York, combined the rose of Lancaster and the rose of York in the Tudor emblem to exploit the union-Elizabeth gave birth to Prince Arthur in September 1486