As I type this, the page's image is a guy in armour and a cloak, holding a sword, walking away from another guy who's on the ground. That doesn't say "oathbreaker" to me, that says "killer".
The caption says that this Lanister guy (whoever he is) is a king-slayer. Again, that's "killer", not "oatrhbreaker".
We have Just a Face and a Caption here. And not a particularly informative caption, to boot; you have to follow a link to find out how any of this relates to the trope.
I don't have a better image to propose, though. Does anyone else?
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