The impoverished earl whose conspiracy cost him his head
In short: Richard of Conisburgh, 3rd Earl of Cambridge, lived a life of strange contradictions. Despite his royal lineage, he was known as the poorest of the earls. This lack of resources may have driven his desperate gamble to depose King Henry V, a plot that ended in his execution.
Around 20 July 1385, Richard was born as the second son of Isabella of Castile and Edmund of Langley, 1st Duke of York. His lineage was prestigious, connecting him to King Edward III and the King of Castile and León, Peter the Cruel. However, his family ties were marked by mystery; he was notably absent from his father's and brother's wills, leading historian G.L. Harriss to suggest he may have been the product of an illicit liaison between his mother and John Holland.
His financial reality was stark. While his mother secured him annuities from King Richard II—including £100 from Yorkshire revenues and 350 marks from the Exchequer in 1393—these were his primary income. After Henry IV took the throne in 1399, these payments became irregular or ceased entirely. Even after being created Earl of Cambridge in 1414, he received no accompanying lands, leaving him with insufficient resources to properly equip himself for military service.
This financial strain likely influenced the Southampton Plot of 1415. Alongside Lord Scrope and Sir Thomas Grey, Richard conspired to replace Henry V with Edmund Mortimer, 5th Earl of March. The conspiracy was betrayed by Mortimer himself on 31 July 1415. Despite pleading for clemency, Richard was beheaded on 5 August 1415 and buried at Southampton. His grandson, King Edward IV, would later attempt to annul the sentence, declaring it unlawful in 1461.
Richard's legacy survived through his son, Richard Plantagenet, 3rd Duke of York, who eventually inherited the titles and estates lost by his father. This lineage would eventually produce King Edward IV and King Richard III.
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