 Grosmont 's uncle , Thomas of Lancaster , was the son and heir of Edward I 's brother Edmund Crouchback . Through his inheritance and a fortunate marriage , Thomas became the wealthiest peer in England , but constant quarrels with King Edward II led to his execution in 1322 . Having no heir , Thomas 's possessions and titles went to his younger brother Henry – Grosmont 's father . Earl Henry of Lancaster assented to the deposition of Edward II in 1327 , but did not long stay in favour with the regency of Queen Isabella and Roger Mortimer . When Edward III took personal control of the government in 1330 , relations with the Crown improved , but by this time the older Henry was already struggling with poor health and blindness . 
 Grosmont <a href='null_genetive' title='1'><mark>'s</mark></a>uncle , Thomas of Lancaster , was the son and heir of Edward I <a href='null_genetive' title='2'><mark>'s</mark></a>brother Edmund Crouchback . Through his inheritance and a fortunate marriage , Thomas became the wealthiest peer in England , but constant quarrels with King Edward II led to his execution in 1322 . Having no heir , Thomas <a href='null_genetive' title='3'><mark>'s</mark></a>possessions and titles went to his younger brother Henry – Grosmont <a href='null_genetive' title='4'><mark>'s</mark></a>father . Earl Henry of Lancaster assented to the deposition of Edward II in 1327 , but did not long stay in <a href='negative_concord' title='5'><mark>favour</mark></a> with <a href='None' title='6'><mark>the</mark></a><a href='negative_concord' title='7'><mark>regency</mark></a> of Queen Isabella and Roger Mortimer . When Edward III took personal control of the government in 1330 , relations with the Crown improved , but by this time the older Henry was already struggling with poor health and blindness . 
Grosmont  uncle , Thomas of Lancaster , was the son and heir of Edward I  homeboy Edmund Crouchback . Through his inheritance and a fortunate marriage , Thomas became the wealthiest peer in England , but constant quarrels with King Edward II led to his execution in 1322 . havin no heir , Thomas  possessions and titles went to his younger brother Henry – Grosmont  father . Earl Henry of Lancaster assented to da deposition of Edward II in 1327 , but did not long stay in no favour with no regency of Queen Isabella and Roger Mortimer . When Edward III took personal control of the government in 1330 , relations with tdaCrown improved , but by this time thdalder Henry was already struggling with poor health and blindness .