Question: What is the birthdate of this King of England, son of Edward, the Black Prince, whose court companion was Robert de Vere, Duke of Ireland?

<P0-S0> Maud de Ufford, Countess of Oxford (1345/1346 – 25 January 1413) was a wealthy English noblewoman and the wife of Thomas de Vere, 8th Earl of Oxford. <P0-S1>  Her only child was Robert de Vere, 9th Earl of Oxford, the favourite of King Richard II of England. <P0-S2>  In 1404 in Essex, she took part in a conspiracy against King Henry IV of England and was sent to the Tower of London; however, she was eventually pardoned through the efforts of Queen consort Joanna of Navarre. <SEP> <P1-S0> Robert de Vere, Duke of Ireland, Marquess of Dublin, and 9th Earl of Oxford KG (16 January 1362 – 22 November 1392) was a favourite and court companion of King Richard II of England. <P1-S1>  He was the ninth Earl of Oxford and the first and only Duke of Ireland and Marquess of Dublin. <SEP> <P2-S0> Richard II (6 January 1367 – c. 14 February 1400), also known as Richard of Bordeaux, was King of England from 1377 until he was deposed on 30 September 1399. <P2-S1>  Richard, a son of Edward, the Black Prince, was born in Bordeaux during the reign of his grandfather, Edward III. <P2-S2>  His father was Prince of Aquitaine. <P2-S3>  Richard was the younger brother of Edward of Angoulême, upon whose death Richard, at three years of age, became second in line to the throne after his father. <P2-S4>  Upon the death of Richard's father prior to the death of Edward III, Richard, by primogeniture, became the heir apparent to the throne. <P2-S5>  With Edward III's death the following year, Richard succeeded to the throne at the age of ten. <SEP> <P3-S0> The Barony of Bannockburn is a Scottish feudal barony located in the historical county of Stirlingshire. <P3-S1>  The first barons of Bannockburn were from the Sandilands and Vere families, descendants of a man named James who around 1348 had been granted the territory of Sandilands, Lesmahagow Lanarkshire, taking the territorial name as his surname. <P3-S2>  He was also later granted the barony of Calder near Edinburgh. <P3-S3>  The link of the Sandilands to Bannockburn was established on 14 July 1489, when King James IV confirmed James Sandelands of Calder and his wife Margaret Kerr his wife in the lands of Bannockburn. <P3-S4>  By 7 July 1509, James Calder had transferred Bannockburn to his son. <P3-S5>  On that date, King James IV confirmed a charter by Sir James Sandelands of Calder granting various lands including the barony of Ouchterbannok alias Bannockburn to his son James Sandelands. <P3-S6>  On 23 August 1510, King James IV granted Sir James Sandelands of Caldour (nephew of Sir James Sandelands and his wife Mariota Forrester), various lands including the lands and barony of Bannockburn. <P3-S7>  Robert De Vere the 6th. <P3-S8>  Earl of Oxford accompanied Edward the 2nd. <P3-S9>  on his campaign which culminated in defeat by the victorious King Robert the Bruce at the Battle of Bannockburn on the 23rd and 24th. <P3-S10>  of June 1314. <P3-S11>  It is by a quirk of fate that the barony of Bannockburn was granted to the Sandilands as they were close relatives to the senior Scottish branch of the Veres both in blood and territorial location their estates in Lanarkshire being contiguous.