Analysis of information sources in references of the Wikipedia article "Llanthony Secunda Priory" in English language version.
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William of Wycumb, the fourth prior of Llanthoni, succeeded to Robert de Braci, who was obliged to quit the monastery on account of the hostile molestation it received from the Welsh.
… during the disturbances of Stephen's reign they suffered so much from the raids of the Welshmen, that under the patronage of Milo of Gloucester, Constable of England, and in 1140 Earl of Hereford, they migrated to Gloucester where a new Llanthony was founded for them in 1136.