I'm aware of particular motivations behind various famous expulsions. The motivation of the Alhambra Decree in 1492 (as I understand it) was primarily to ensure that converted Jews did not revert to Jewish practice.

The motivation of the Edict of Expulsion of 1290 (again, as I've understood it) was the fact that the English Crown was deeply in debt and expelling your creditors is one way to get out of it.

I've heard the motivation behind the Code Noir of 1685, banning all Jews from living in French colonies and expelling the ones already there, was that Louis XIV was concerned about French colonies with small populations developing a non-Catholic majority (which is why it also required all slaves to be baptized Catholic).

(Obviously correct me if I've said anything incorrect here)

But there does not seem to be an obvious pattern from the handful of examples I'm aware of. For people who have studied this subject more broadly: Is there any particular pattern for reasons behind various Jewish expulsions? What were the most common motivations, and were any of the examples I listed particularly unusual in their motivations?