John I of Alençon, called the Sage (1385, Château d'Essay, – 25 October 1415, Azincourt

Azincourt

Azincourt is a commune in the Pas-de-Calais department in northern France.-Geography:Situated 12 miles north-west of Saint-Pol-sur-Ternoise on the D71 road.-Etymology:...

), was the son of Peter II of Alençon

Peter II of Alençon

Peter II of Alençon, called the Noble , was the son of Charles II of Alençon and Maria de la Cerda. He was Count of Alençon 1361–1404 and Count of Perche 1377–1404....

 and Marie de Chamaillard. In 1404, he succeeded his father as Count of Alençon and Perche. He was made Duke of Alençon in 1414.

He commanded the second division of the French army at the Battle of Agincourt

Battle of Agincourt

The Battle of Agincourt was a major English victory against a numerically superior French army in the Hundred Years' War. The battle occurred on Friday, 25 October 1415 , near modern-day Azincourt, in northern France...

. When the English broke through the first division, he led a countercharge. He is sometimes credited with killing Edward, Duke of York, wounding Humphrey, Duke of Gloucester

Humphrey, Duke of Gloucester

Humphrey of Lancaster, 1st Duke of Gloucester, 1st Earl of Pembroke, KG , also known as Humphrey Plantagenet, was "son, brother and uncle of kings", being the fourth and youngest son of king Henry IV of England by his first wife, Mary de Bohun, brother to king Henry V of England, and uncle to the...

, and cutting an ornament from the crown of Henry V of England

Henry V of England

Henry V was King of England from 1413 until his death at the age of 35 in 1422. He was the second monarch belonging to the House of Lancaster....

; but he was then overpowered by King's bodyguard, and slain by the Welsh nobleman Dafydd Gam

Dafydd Gam

Dafydd ap Llewelyn ap Hywel , better known as Dafydd Gam or Davy Gam, was a Welsh medieval nobleman, a prominent opponent of Owain Glyndŵr, who died at the Battle of Agincourt fighting for King Henry V, King of England in that victory against the French...

 before he could yield himself.

Family

In 1396, he married Marie of Brittany (1391–1446), daughter of John V, Duke of Brittany

John V, Duke of Brittany

John V the Conqueror KG was Duke of Brittany and Count of Montfort, from 1345 until his death.-Numbering:...

. They had five children:

1. Pierre d'Alençon (1407, Argentan
   Argentan
   Argentan is a commune, and the seat of two cantons and of an arrondissement in the Orne department in north-western France.Argentan is located NE of Rennes, ENE of the Mont Saint-Michel, SE of Cherbourg, SSE of Caen, SW of Rouen and N of Le Mans....
   
    – 1408)
2. Jean d'Alençon, Duke of Alençon (1409–1476)
3. Marie d'Alençon (1410, Argentan, – 1412, Argentan)
4. Jeanne d'Alençon (1412, Argentan – 1420)
5. Charlotte d'Alençon (1413, Argentan – 1435, Lamballe
   Lamballe
   Lamballe is a commune in the Côtes-d'Armor department in Brittany in northwestern France.It lies on the Gouessant east-southeast of Saint-Brieuc by rail.- History :...
   
   )

He also had two illegitimate children:

1. Pierre d'Alençon (d. 1424, Battle of Verneuil
   Battle of Verneuil
   The Battle of Verneuil was a battle of the Hundred Years' War, fought on 17 August 1424 near Verneuil in Normandy and was a significant English victory.-The black time:...
   
   ), Lord of Gallandon
2. Marguerite d'Alençon, married Jean de St-Aubin, Lord of Preaux