On 19 Oct 1216 [her grandfather] King John "Lackland" of England (age 49) died at Newark Castle [Map]. His son [her father] King Henry III of England (age 9) succeeded III King England.

John Monmouth (age 34) was present.

On his deathbed, John appointed a council of thirteen executors to help Henry reclaim the kingdom and requested that his son be placed into the guardianship of William Marshal 1st Earl Pembroke (age 70).

King John's will is the earliest English royal will to survive in its original form. The document is quite small, roughly the size of a postcard and the seals of those who were present at the time would have been attached to it. Translation of the will taken from an article by Professor S.D. Church in the English Historical Review, June 2010:

I, John, by the grace of God king of England, lord of Ireland, duke of Normandy and Aquitaine, count of Anjou, hindered by grave infirmity and not being able at this time of my infirmity to itemize all my things so that I may make a testament, commit the arbitration and administration of my testament to the trust and to the legitimate administration of my faithful men whose names are written below, without whose counsel, even in good health, I would have by no means arranged my testament in their presence, so that what they will faithfully arrange and determine concerning my things as much as in making satisfaction to God and to holy Church for damages and injuries done to them as in sending succour to the land of Jerusalem and in providing support to my sons towards obtaining and defending their inheritance and in making reward to those who have served us faithfully and in making distribution to the poor and to religious houses for the salvation of my soul, be right and sure. I ask, furthermore, that whoever shall give them counsel and assistance in the arranging of my testament shall receive the grace and favour of God. Whoever shall infringe their arrangement and disposition, may he incur the curse and indignation of almighty God and the blessed Mary and all the saints.

In the first place, therefore, I desire that my body be buried in the church of St Mary and St Wulfstan at Worcester. I appoint, moreover, the following arbiters and administrators: the lord Guala, by the grace of God, cardinal-priest of the title of St Martin and legate of the apostolic see; the lord Peter bishop of Winchester; the lord Richard bishop of Chichester; the lord Silvester bishop of Worcester; Brother Aimery de St-Maur; William Marshal earl of Pembroke; Ranulf earl of Chester; William earl Ferrers; William Brewer; Walter de Lacy and John of Monmouth; Savaric de Mauléon; Falkes de Bréauté.

The signatories were:

Guala Bicchieri (ca 1150 - 1227) Papal Legate.

Bishop Peter de Roches, Bishop of Winchester.

Richard le Poer (? - 1237), Bishop of Chichester.

Sylvester of Worcester, Bishop of Worcester.

Aimery de St-Maur (? -?1219), Master of the English Templars.

William Marshal 1st Earl Pembroke (age 70).

Ranulf de Blondeville Gernon 6th Earl Chester 1st Earl Lincoln (age 46).

William Ferrers 4th Earl of Derby (age 48).

William Brewer (? - 1226), 1st Baron Brewer.

Walter de Lacy (ca 1172-1241) Lord of Meath.

John: (1182 - 1248) Lord of Monmouth.

Savaric de Mauléon (? - 1236) Seneschal of Poitou from 1205.

Falkes de Bréauté (? - 1226) Seneschal of Cardiff Castle.