User blog comment:Jazon Naparleon/Questions of Romans and Mongols/@comment-4758513-20120815064523

According to my knowledge, the mongols landed in Japan, defeated the Japanese twice, then went back in their ships and then were whacked by the storm. So, had there been no storm, combined with the possibility of reinforcements, it is possible, although it would take some time to do.

Ceasarion, I don't know. I suppose one of his descendents could, but only if he tried when the current dynasty fell, in which case he would have to be popular with the troops and such to win, which he may very well not be.