What happened to William the Lion after he was captured at Alnwick in 1174?

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King Henry II and St. Thomas Becket — Henry II Henry II (left) disputing with Thomas Becket (center), miniature from a 14th-century manuscript; in the British Library (Cotton MS. Claudius D.ii).

After being captured at Alnwick in 1174, William I (known as William the Lion) was released only after agreeing to submit to the feudal overlordship of Henry II of England.1

As part of these terms, William also had to acknowledge the supremacy of the English church over the Scottish church. This period of subjection lasted for 15 years until 1189, when William secured his release from these obligations by paying a significant sum of money to Henry's successor, Richard I.1