Fostering and Adoption as a tool of Conquest

What are some good examples of cultures that used these tools effectively.

Mongols and Iroquois used this very effectively to turn foes into friends/allies.
It was used in hostage situations in Christianization.
It was also used by Scottish/Irish to build intra-clan loyalty.

What are other good examples and also some atl situations where it might have been used.

Edit: Let's talk a little about what/why one system or another was particularly effective.
 
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I'll give a setting and some background for one scenario in order to suck people into this conversation.

https://www.historyireland.com/medi.../fosterage-child-rearing-in-medieval-ireland/

Short article of Irish Fostering of upper class children and how it was used to build alliances.

Here is a background, just the stuff up to when Thorgest goes swimming with stones.

Lets say Thorgest ends up High King. Lets say he gets wind of the Irish custom and insists that many of his recently defeated new subjects have their kids fostered among himself and his followers. Could he set up a long term trend of Norsifying the Irish upper classes rather than the Norse Gaelicizing as otl? How about using it to unite his Danish, Norweign and Irish allies more firmly?
 
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