Syncretism

The merging of gods from different traditions, or of different gods within one, into a single figure — Serapis, the Ptolemaic god made from Osiris-Apis and a Greek Pluto; Zeus Ammon, the ram-horned Zeus of the Libyan oracle; and the compound names of the Egyptian texts themselves, Amen-Ra, Ptah-Seker-Tem, Hathor-Sekhmet. Where interpretatio names one god with another's name, syncretism makes a new god of the two.