I think at least part of the meaning is 'to add' and maybe another part of the meaning is 'to alter'.
I'm sure is spelt using the letter 'x'.
I remember reading the word a while ago. I'm quite sure I was reading about the 'Siege of Jerusalem' and the word was used to say that more people were added to the populace of the city after it was conquered by their kingdom.
Best Answer
Within the context, I guess the word you are looking for is Annex / Annexed.
Which means:
To append or attach, especially to a larger or more significant thing.
To incorporate (territory) into an existing political unit such as a country, state, county, or city.
To add or attach, as an attribute, condition, or consequence.
Source: [TFD]