Question: When was John's eldest son crowned?

Knowledge 1: John, King of England
John's first wife, Isabel, Countess of Gloucester, was released from imprisonment in 1214; she remarried twice, and died in 1217. John's second wife, Isabella of Angoulême, left England for Angoulême soon after the king's death; she became a powerful regional leader, but largely abandoned the children she had had by John. John had five legitimate children, all by Isabella. His eldest son, Henry III, ruled as king for the majority of the 13th century. Richard became a noted European leader and ultimately the King of the Romans in the Holy Roman Empire. Joan married Alexander II of Scotland to become his queen consort. Isabella married the Holy Roman Emperor Frederick II. His youngest daughter, Eleanor, married William Marshal's son, also called William, and later the famous English rebel Simon de Montfort. John had a number of illegitimate children by various mistresses, including nine sons – Richard, Oliver, John, Geoffrey, Henry, Osbert Gifford, Eudes, Bartholomew and probably Philip – and three daughters – Joan, Maud and probably Isabel. Of these, Joan became the most famous, marrying Prince Llywelyn the Great of Wales. [SEP] Knowledge 2: Westminster Abbey
Since the coronations in 1066 of both King Harold and William the Conqueror, coronations of English and British monarchs were held in the abbey. In 1216, Henry III was unable to be crowned in London when he first came to the throne, because the French prince Louis had taken control of the city, and so the king was crowned in Gloucester Cathedral. This coronation was deemed by the Pope to be improper, and a further coronation was held in the abbey on 17 May 1220. The Archbishop of Canterbury is the traditional cleric in the coronation ceremony.[citation needed]
Knowledge 1: John, King of England
John's first wife, Isabel, Countess of Gloucester, was released from imprisonment in 1214; she remarried twice, and died in 1217. John's second wife, Isabella of Angoulême, left England for Angoulême soon after the king's death; she became a powerful regional leader, but largely abandoned the children she had had by John. John had five legitimate children, all by Isabella. His eldest son, Henry III, ruled as king for the majority of the 13th century. Richard became a noted European leader and ultimately the King of the Romans in the Holy Roman Empire. Joan married Alexander II of Scotland to become his queen consort. Isabella married the Holy Roman Emperor Frederick II. His youngest daughter, Eleanor, married William Marshal's son, also called William, and later the famous English rebel Simon de Montfort. John had a number of illegitimate children by various mistresses, including nine sons – Richard, Oliver, John, Geoffrey, Henry, Osbert Gifford, Eudes, Bartholomew and probably Philip – and three daughters – Joan, Maud and probably Isabel. Of these, Joan became the most famous, marrying Prince Llywelyn the Great of Wales. [SEP] Knowledge 2: Succession to the British throne
Queen Elizabeth II is the sovereign, and her heir apparent is her eldest son, Charles, Prince of Wales. Next in line after him is Prince William, Duke of Cambridge, the Prince of Wales's elder son. Third in line is Prince George, the son of the Duke of Cambridge, followed by his sister, Princess Charlotte. Fifth in line is Prince Henry, the younger son of the Prince of Wales. Sixth in line is Prince Andrew, Duke of York, the Queen's second - eldest son. Any of the first six in line marrying without the sovereign's consent would be disqualified from succession.
Knowledge 1: John, King of England
John's first wife, Isabel, Countess of Gloucester, was released from imprisonment in 1214; she remarried twice, and died in 1217. John's second wife, Isabella of Angoulême, left England for Angoulême soon after the king's death; she became a powerful regional leader, but largely abandoned the children she had had by John. John had five legitimate children, all by Isabella. His eldest son, Henry III, ruled as king for the majority of the 13th century. Richard became a noted European leader and ultimately the King of the Romans in the Holy Roman Empire. Joan married Alexander II of Scotland to become his queen consort. Isabella married the Holy Roman Emperor Frederick II. His youngest daughter, Eleanor, married William Marshal's son, also called William, and later the famous English rebel Simon de Montfort. John had a number of illegitimate children by various mistresses, including nine sons – Richard, Oliver, John, Geoffrey, Henry, Osbert Gifford, Eudes, Bartholomew and probably Philip – and three daughters – Joan, Maud and probably Isabel. Of these, Joan became the most famous, marrying Prince Llywelyn the Great of Wales. [SEP] Knowledge 2: Succession to the British throne
Queen Elizabeth II is the sovereign, and her heir apparent is her eldest son, Charles, Prince of Wales. Next in line after him is Prince William, Duke of Cambridge, the Prince of Wales's elder son. Third in line is Prince George, the son of the Duke of Cambridge, followed by his sister, Princess Charlotte. Fifth in line is Prince Henry of Wales, the younger son of the Prince of Wales. Sixth in line is Prince Andrew, Duke of York, the Queen's second - eldest son. Any of the first six in line marrying without the sovereign's consent would be disqualified from succession.

Answer: 1216