Thomas de Mowbray , 1st Duke of Norfolk Thomas de Mowbray , 1st Duke of Norfolk , , ( 22 March 1367 or 1368 – 22 September 1399 ) was an English peer . As a result of his involvement in the power struggles which led up to the fall of Richard II , he was banished and died in exile in Venice . Family . Mowbray was the second son of John de Mowbray , 4th Baron Mowbray , and Elizabeth de Segrave , " suo jure " Lady Segrave , daughter and heiress of John de Segrave , 4th Baron Segrave , by Margaret , daughter and heiress of Thomas of Brotherton , son of Edward I . He had an elder brother , John de Mowbray , 1st Earl of Nottingham , and three sisters , Eleanor , Margaret and Joan ( for details concerning his siblings see the article on his father , John de Mowbray , 4th Baron Mowbray ) . Career . In April 1372 , custody of both Thomas and his elder brother , John , was granted to Blanche Wake , a sister of their grandmother , Joan of Lancaster . On 10 February 1383 , he succeeded his elder brother , John Mowbray , 1st Earl of Nottingham , as Baron Mowbray and Segrave , and was created Earl of Nottingham on 12 February 1383 . On 30 June 1385 he was created Earl Marshal for life , and on 12 January 1386 he was granted the office in tail male . He fought against the Scots and then against the French . He was appointed Warden of the East March towards Scotland in 1389 , a position he held until his death . He was one of the Lords Appellant to King Richard II who deposed some of the King ' s court favourites in 1387 . The King ' s uncle , Thomas of Woodstock , 1st Duke of Gloucester , was imprisoned at Calais , where Nottingham was Captain . When Gloucester was killed in 1397 , it was probably at the King ' s orders and probably with Nottingham ' s involvement . On 29 September 1397 he was created Duke of Norfolk . In 1398 , Norfolk quarrelled with Henry of Bolingbroke , 1st Duke of Hereford ( later King Henry IV ) , apparently due to mutual suspicions stemming from their roles in the conspiracy against the Duke of Gloucester . Before a duel between them could take place , Richard II banished them both . Mowbray left England on 19 October 1398 . While in exile , he succeeded as Earl of Norfolk when his grandmother , Margaret , Duchess of Norfolk , died on 24 March 1399 . Hereford returned to England in 1399 and usurped the crown on 30 September 1399 ; shortly afterward , on 6 October 1399 , the creation of Mowbray as Duke of Norfolk was annulled by Parliament , although Mowbray retained his other titles . He died of the plague at Venice on 22 September 1399 . Marriages and issue . He married firstly , after 20 February 1583 , Elizabeth le Strange ( c . 6 December 1373 – 23 August 1383 ) , " suo jure " Lady Strange of Blackmere , daughter and heiress of John le Strange , 5th Baron Strange of Blackmere , by Isabel Beauchamp , daughter of Thomas Beauchamp , 11th Earl of Warwick , by whom he had no issue . He married secondly Elizabeth Arundel ( c . 1372 – 8 July 1425 ) , widow of Sir William Montagu , and daughter of Richard FitzAlan , 11th Earl of Arundel , by Elizabeth Bohun , daughter of William de Bohun , 1st Earl of Northampton , by whom he had two sons and three daughters : Shakespeare . Mowbray ' s quarrel with Bolingbroke and subsequent banishment are depicted in the opening scene of Shakespeare ' s " Richard II " . Thomas Mowbray ( as he is called in the play ) prophetically replies to King Richard ' s " Lions make leopards tame " with the retort , " Yea , but not change his spots . " Mowbray ' s death in exile is announced later in the play by the Bishop of Carlisle . References .