Fergus of Galloway married to David's older sister, Edith (died 1118), a union which closely bound him to the Scottish royal house. For as long as Henry I lived, relations between him and David remained harmonious. When the former died in 1135, however, the peace between the neighbouring realms was shattered when his nephew, Stephen of Blois, Count of Boulogne and Mortain (died 1154), successfully seized the throne. Before the end of the year, the Scots surged forth and seized Carlisle and Cumberland before peace was restored. Relations broke down the following year, and the Scots again invaded in 1137, seizing Northumberland, and
Princes in the Tower Jan Allertz (Recorder of Rotterdam), all state that Richard killed the princes before he seized the throne (thus before June 1483). De Commines' "Memoirs" (c.1500), however, identifies the Duke of Buckingham as the person "who put them to death". Only Mancini's account is truly contemporary, having been written in London before November 1483. The Croyland Chronicle and de Commines' account were written three and seventeen years later, respectively (and thus after Richard III's death and the accession of Henry VII). Markham, writing long before Mancini's account was discovered, argued that some accounts, including the Croyland Chronicle, might have been authored