How far into Germania had Rome campaigned at this point, historically? Need to know if I'm to make a good Thor, which I've decided to do.
They own about half of bavaria and everything to the Rhine. Howerver nearly a century ago, Rome had invaded and occupied nearly 3/4s of Germany rather than just 1/4th of it as they do now. They got forced back to the Rhine after the Battle of Teutoburg forest which saw a lot of Roman legions dead, and essentially kept the Roman border with Germany static for centuries afterwards. (It was one of the largest and most horrible defeats in Roman history relative to Rome's geopolitical situation at the time, and really hurt the Empire badly. The reason the Empire didn't own Germany and maybe bits of Eastern Europe is because of this, possibly.)
You could relate that huge defeat with your pantheon. It'd make sense if Thor and the Norse/Germanic pantheon intervened to save Germany from Roman Rule, and basically crushed the Greek pantheon in a decisive battle, forcing them nearly completely out of Germany in the process. When it comes to battles, Thor would be at the forefront, so it could certainly relate to your character.