“Just as in Egypt, where Hashem appointed two messengers to lead the Jews out of slavery, Moshe and Aharon, so too, will we have two emissaries by the final redemption, Mashiach Ben Yosef and Mashiach Ben Dovid.  Why?  One to take the Jews out of galus and one to take the galus out of the Jews!” ~ R’ Shmuel Mohilever zt”l (Torah Tavlin)