1. WILLIAM¹ DE GLASTONIA was born between 1020 and 1231, and died between 1131 and 1341^[4]. He married (BX-2) MATILDA ARUNDEL, daughter of (BX-1) Roger ARUNDEL. ^[2]
Mentioned in 1131. William was tenant of the abbess of Shaftesbury.^[4]
Child:

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ROBERT2 DE GLASTONIA, LORD OF POORSTOCK of Poorstock, Dorset, England, United Kingdom, b. about 1150 of Poorstock[4]; d. about 1250[4]; m. (AHB-3) ALICE DE PERCY _____, daughter of (AHB-1) Gerbert, Lord of Poorstock and (BY-3) Maud (ARUNDEL).

2. ROBERT² DE GLASTONIA, LORD OF POORSTOCK (William¹) of Poorstock, son of (1) William¹ and (BX-2) Matilda (ARUNDEL) DE GLASTONIA, was born between 1050 and 1232, and died between 1161 and 1341^[4]. He married (AHB-3) ALICE DE PERCY _____, daughter of (AHB-1) Gerbert, Lord of Poorstock and (BY-3) Maud (ARUNDEL). ^{[1, 2]}
Robert answered for scutage on 5 knights' fees in 1161. He was possibly son of William de Glastonia who is mentioned in 1131.^[4]
Bartlett (in 1914) lists Robert's mother as Matilda Arundel daughter of Roger Arundel. However, Sanders (in 1960) lists his wife's mother as Maud (which is another name for Matilda) daughter of Roger Arundel. Hence, it is possible the same person is referred to, and Bartlett is in error.
Child:

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MATILDA3 DE GLASTONIA, b. about 1130/1; d. about 1200; m. before 1172[4] (AM-47) ROGER DE NEUFBOURG, LORD OF POORSTOCK of Winfrith, Dorset, b. of Winfrith[3] about 1135[3], d. in 1194[4], son of (AM-30) Robert and (APG-5) Godehaut (de TOENI) DE NEUFBOURG.

3. MATILDA³ DE GLASTONIA (Robert², William¹), daughter of (2) Robert², Lord of Poorstock and (AHB-3) Alice de Percy (_____), was born between 1109/10 and 1158, and died between 1165 and 1268. She married before 1172^[4], (AM-47) ROGER DE NEUFBOURG, LORD OF POORSTOCK of Winfrith, son of (AM-30) Robert and (APG-5) Godehaut (de TOENI) DE NEUFBOURG, who was born about 1135^[3] of Winfrith^[3], died in 1194^[4], and was buried in Bindon Abbey, Dorset^[3]. ^{[1, 2, 4]}
Child: See (AM-47) Roger de NEUFBOURG, Lord of Poorstock