Amphion and Zethus
The strangers who take up the child are often shepherds or other herdsmen. This befell not only Oedipus, but also Cyrus II of Persia, Amphion and Zethus and several of the characters listed above. Romulus and Remus were suckled by a wolf in the wilderness, but afterward, again found by a shepherd. This ties this motif in with the genre of the pastoral. This can imply or outright state that the child benefits by this pure upbringing by unspoiled people, as opposed to the corruption that surrounded his birth family.