Original: However, after a military standoff at Wallingford with Henry, and following the death of his son and heir, Eustace, in 1153, he was persuaded to reach a compromise with Matilda (known as the Treaty of Wallingford or Winchester), whereby her son Henry would succeed Stephen to the English throne.
Simplified: This ended with the Treaty of Wallingford in 1153 after the death of Stephen's son and heir, Eustace IV.