Roger de Mortimer, 4th Earl of March, 6th Earl of Ulster (11 April 1374 20 July 1398) was an English nobleman. He was considered the heir presumptive to King Richard II, his mother's first cousin.

Roger Mortimer's father, the 3rd Earl of March, died in 1381, leaving the six-year-old Roger to succeed to his father's title. Roger was placed under the wardship of Thomas Holland, 2nd Earl of Kent and eventually married Holland's daughter Alianore. During his lifetime, Mortimer spent much time in Ireland; he served several tenures as Lord Lieutenant of Ireland and died during a battle at Kellistown, Co. Carlow. He was succeeded by his young son, Edmund Mortimer, 5th Earl of March.

The English people are an ethnic group and nation native to England, who speak the English language and share a common history and culture. The English identity is of early medieval origin, when they were known in Old English as the Angelcynn ('race or tribe of the Angles'). Their ethnonym is derived from the Angles, one of the Germanic peoples who migrated to Great Britain around the 5th century AD.The English largely descend from two main historical population groups – the West Germanic tribes who settled in southern Britain following the withdrawal of the Romans (the Angles, Saxons, Jutes and Frisians), and the partially Romanised Celtic Britons already living there. Collectively known as the Anglo-Saxons, they founded what was to become the Kingdom of England by the early 10th century, in response to the invasion and minor settlement of Danes that began in the late 9th century. This was followed by the Norman Conquest and limited settlement of Anglo-Normans in England in the later 11th century. Some definitions of English people include, while others exclude, people descended from later migration into England.England is the largest and most populous country of the United Kingdom of Great Britain and Northern Ireland. In the Acts of Union 1707, the Kingdom of England and the Kingdom of Scotland merged to become the Kingdom of Great Britain. Over the years, English customs and identity have become fairly closely aligned with British customs and identity in general. The majority of people living in England are British citizens.