Richard of Conisburgh, 3rd Earl of Cambridge (c. 20 July 1375 – 5 August 1415) was the second son of Edmund of Langley, 1st Duke of York, and Isabella of Castile. At the age of forty, he was beheaded for his part in the Southampton Plot, a conspiracy against King Henry V. He was the father of Richard Plantagenet, 3rd Duke of York, and the grandfather of King Edward IV and King Richard III.
Richard was born about 20 July 1375 at Conisbrough Castle, Yorkshire, the second son of Edmund of Langley, 1st Duke of York, and his first wife, Isabella of Castille. On his father's side, he was the grandson of King Edward III and Philippa of Hainault, and on his mother's side, the grandson of Peter the Cruel, King of Castile and Leon, and his favourite mistress, María de Padilla (d.1361). His godfather was King Richard II. Richard was two years younger than his brother, Edward. There is no record of his birth or baptism and others put his birth in 1385. Richard II was in York on 20 July 1385, and in 1375 the future king was only eight years old; it was unlikely he would have been a godfather at that age, and with his father still alive. 
Strangely, Richard received no lands from his father and was mentioned neither in his father's will nor his brother's will. This circumstance has been taken by G.L. Harriss as an indication that Richard's father and brother did not recognize him as a full blood relative, and that he may have been the child of an illicit liaison between his mother and John Holland, 1st Duke of Exeter.
Although Edmund of Langley made no provision for Richard in his will of 25 November 1400, his mother Isabella named King Richard II as her heir before her death on 23 December 1392 and requested him to grant her younger son an annuity of 500 marks. The king complied. On 3 February 1393, he provided his godson with an annuity of £100 from the revenues in Yorkshire that Isabella had formerly received, and on 16 March 1393, he provided him with a further annuity of 350 marks (£233 6s 8d) from the Exchequer. According to T. B. Pugh, further largess from the king might have been expected when Richard came of age, however Richard II was deposed in 1399. According to G. L. Harriss, Richard of York 'received no favours from the new King, Henry IV'. After Henry IV's accession, Richard's annuities, his sole source of income, were either paid irregularly, or not paid at all.
From April 1403 to October 1404, Richard commanded a small force defending Herefordshire against the Welsh rebel leader Owain Glyndŵr, but otherwise performed no notable military service. However, it was during this period, according to T. B. Pugh, that Richard established the relationships with the Mortimer and Cherleton families that brought about his marriage to Anne de Mortimer. Richard's only other significant appointment during this period came in August 1406 when, together with the Bishop of Bath, Lord Fitz Hugh, and Lord Scrope, he was chosen to escort King Henry's daughter Philippa to Denmark for her marriage to King Eric. Richard was knighted in July of that year, perhaps in anticipation of this embassy. Pugh notes that during this three-month embassy to Denmark, Richard would have become well acquainted with Lord Scrope, who married Richard's stepmother Joan Holland in September 1411, and with whom Richard later became involved in the Southampton Plot of 1415 that cost them both their lives.
In the Parliament of 1414, Richard was created Earl of Cambridge, a title formerly held by his elder brother, Edward, 2nd Duke of York, who had earlier ceased to be Earl of Cambridge either by resignation or deprivation of the title.
Richard's creation as Earl of Cambridge in 1414, however, brought with it no accompanying grant of lands, and according to Harriss, Cambridge was 'the poorest of the earls' who were to set out on Henry V's invasion of France. As a result, he lacked the resources to equip himself properly for the expedition. Perhaps partly for this reason, Cambridge conspired with Lord Scrope and Sir Thomas Grey to depose King Henry and place his late wife Anne's brother Edmund Mortimer, 5th Earl of March, on the throne. On 31 July, Mortimer revealed the plot to the king. Later, he served on the commission that condemned Cambridge to death. Although Cambridge pleaded with the king for clemency, he was beheaded on 5 August 1415 and buried in the chapel of God's House at Southampton. The fleet set sail for France a few days later, on 11 August 1415.
Although Cambridge's title was forfeited, he was not attainted, and his four-year-old son Richard was his heir. Within three months, Cambridge's elder brother, Edward of Norwich, 2nd Duke of York, was slain at Agincourt, and Cambridge's four-year-old son eventually inherited his uncle's titles and estates as well as his father's.
The marriage took place secretly, without parental consent, and was validated on 23 May 1408 by papal dispensation. It brought Richard no financial benefit, since Anne's only income was an annuity of £50 granted for her maintenance by Henry IV in 1406.
By his first wife, Cambridge had two sons and a daughter:
Anne de Mortimer died on 21 September 1411 soon after the birth of her son Richard. She was buried at Kings Langley, Hertfordshire, once the site of Kings Langley Palace, perhaps in the conventual church which houses the tombs of her husband's father Edmund and his first wife Isabella of Castile.
After the death of Anne de Mortimer, Cambridge married Maud Clifford, the divorced wife of John Neville, 6th Baron Latimer, and daughter of Thomas de Clifford, 6th Baron de Clifford, by Elizabeth, daughter of Thomas de Ros, 4th Baron de Ros, of Helmsley.
After Cambridge's death in 1415, his second wife, Maud Clifford, is said to have lived in 'great state' at Conisbrough Castle and elsewhere. She died on 26 August 1446 and was buried at Roche Abbey, Yorkshire. She left a will dated 15 August 1446 in which no mention is made of her stepchildren.
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|Ancestors of Richard of Conisburgh, 3rd Earl of Cambridge|
|Peerage of England|
Edward of Norwich
|Earl of Cambridge