Alice de Bohun was the daughter of Humphrey de Bohun, Knt., Earl of Hereford and Essex, by his 1st wife, Maud, daughter of Raoul (or Ralph) d'Exoudun (or d'Issoudun), Count of Eu.
Alice's age at the time of the marriage agreement in 1239 is unknown, however, since her groom was aged 4 at the time, it should be assumed that both were young children and that the marriage would not become effective for some years.
To assign a date, make Alice 3 years younger than Roger de Tony and thus 1 year old in 1239 and born in 1238.
1239 Agreement to Marry Roger de Tony (age 4)
Roger de Tony married by agreement dated 30 June 1239 Alice de Bohun, daughter of Humphrey de Bohun, Knt, Earl of Hereford and Essex, by his first wife, Maud, daughter of Raoul (or Ralph) d'Exoudun (or d'Issoudun), Count of Eu. Her maritagium included the manors of Newton Tony and East Coulston, Wiltshire.
The same year, 1239, Roger’s father died at sea.
Roger de Tony was titled Baron of Flamstead, Hertfordshire.
Roger was born about 29 Sept 1235 (minor in 1251, came of age in 1256). 
This means Roger was aged 4 at the time of the marriage agreement, and one must assume that the marriage became effective some years later!
Roger became a ward to Humphrey de Bohun.
1254 Marriage is Effective
1254, Roger married Alice. Since Roger was aged 4 in 1239, he would be aged 19, fifteen years later.
Alice de Tony born ~1260 in England. Married Walter Beauchamp, Knt., of Alcester, Warwickshire. 
1242 Queen Eleanor assumes custody of Roger's lands
4/26/1242, Grant to Queen Eleanor of the custody, during the minority of the heir, of the lands of Ralph de Tony, to receive in her wardrobe all the issues thereof, with the wards and escheats belonging thereto. 
10/15/1242, the Earl of Hereford & Wessex was ordered to deliver Paincastle to Roger,who held it by knight’s service.
6/20/1251, Memorandum … the Earl [H. de Boun, Earl of Essex and Hereford] … keep during the minority of Roger son and heir of Ralph de Thoeny. When he comes of age the Earl will restore it [Painscastle] to the king to surrender to the heir. 
Death and Burial
At her death Alice was buried in Llanthony Abbey outside Gloucester.  That would be Llanthony Secunda, a daughter cell of Llanthony Priory in the Black Mountains, Wales, founded about 1135. 
Married Isabel ____
When Alice (Bohun) de Toeni died is unknown, only that she was alive in 1255. 
Roger de Tony married second Isabel (Unknown).  Roger died May 1264. Isabel was alive in 1270. 
Burial of Alice, wife of Roger de Tony
She was buried in Llanthony (Secunda) Abbey outside Gloucester. 
↑ 1.01.11.21.126.96.36.199 Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families. Kimball G. Everingham, editor. Salt Lake City, Utah, 2013: By the author. 5 Volumes. Volume 5, 174-175
↑Magna Carta Ancestry: A Study in Colonial and Medieval Families, Vol IV, page 200, #3
↑ Epistolae: Women’s Biography, Eleanor of Provence.
In celebration of the 800th Anniversary of the Magna Carta, the Magna Carta Project is reviewing and enhancing all the profiles between Magna Carta Sureties and Gateway Ancestors. A. Tompkins and I are doing what we can to enhance the trail between Henry de Bohun and Henry Norwood. We appreciate all the work that has already been done to this profile and look forward to any additional contributions we can make to it.