Excerpts from Books and Wikipedia
"End of Plantagenet dynasty, beginning of the Lancaster lineage of kings." [Wikipedia: Timeline of Middle Ages] "Henry IV (April 1367 – 20 March 1413) or Henry Bolingbroke was King of England from 1399 to 1413. He asserted the claim of his grandfather King Edward III, a maternal grandson of Philip IV of France, to the Kingdom of France. Henry was the first English ruler since the Norman Conquest, over three hundred years prior, whose mother tongue was English rather than French." [Wikipedia] "Meanwhile, Richard was delayed in his return from Ireland and did not land in Wales until 24 July. He made his way to Conwy, where on 12 August he met with the Earl of Northumberland for negotiations. On 19 August, Richard surrendered to Henry Bolingbroke at Flint Castle, promising to abdicate if his life were spared. Both men then returned to London, the indignant king riding all the way behind Henry. On arrival, he was imprisoned in the Tower of London on 1 September." [Wikipedia]