Unhistorical and Contradictory?

"And this many of the simpler sort, not understanding, have said there is a discordance; because Luke saith it was Mary to whom he [the angel] declared the good tidings, but Matthew, that it was Joseph; not knowing that both took place. And this sort of thing it is necessary to bear in mind throughout the whole history; for in this way we shall solve many seeming discordances." (John Chrysostom, Homilies on Matthew, 4:9)