Over the course of the series, Fire Emblem has had it's share of what I'm calling Evil Usurpers: a sort-of disc-one villain that typically begins the plot by being leader of the group that often betrays the king, and always leads the overthrow and/or occupation of the hero's kingdom; usually on behalf of the major villains. These villains set up an early personal conflict for the heroes, while also setting up the grander arc by being just a minion in the grand scheme of things.
Which one do you think was the best of these? If there's one that fits this archetype that I missed, please let me know. Similarly, if there's someone on this list that you think shouldn't be on this list, please let me know and give your reasons why they shouldn't be on the list. If at least two people mention why they should/shouldn't be on the list, then I'll add/remove them.
Note: if the Evil Emperor himself leads the overthrow and/or occupation (such is the case with Ashnard in Path of Radiance and Lekain in Part 3 of Radiant Dawn), the Evil Emperor does not belong on this list as they're a main villain; this is just about the ones that are the main villain for a particular arc.