Thomas of Lancaster, 1st Duke of Clarence [SEP] mother
Thomas of Lancaster, 1st Duke of Clarence
Thomas of Lancaster, 1st Duke of Clarence (autumn 1387 – 22 March 1421) was a medieval English prince and soldier, the second son of King Henry IV of England and brother of Henry V. He acted as councillor and aide to both. After the death of his father he participated in the military campaigns of his brother in France during the Hundred Years' War. 
Heir to the throne in the event of his brother's death, he was left in charge
(died 1421)
- Margaret Holland, Duchess of Clarence, noblewoman (died 1429)
- 1387
- 9 August – King Henry V (died 1422)
- 1388
- 29 September – Thomas of Lancaster, 1st Duke of Clarence, second son of King Henry IV (died 1421)
- Juliana Berners, writer
- Thomas Montacute, 4th Earl of Salisbury (died 1428)
- 1389
- 20 June – John of Lancaster, 1st Duke of Bedford, regent (died 1435