The "libation vase of Gudea" with the dragon Mušḫuššu, dedicated to Ningishzida, circa 2100 BCE (short chronology). The caduceus-like symbol (right) is interpreted as a representation of the god himself. Inscription: "To the god Ningiszida, his god, Gudea, Ensi (governor) of Lagash, for the prolongation of his life, has dedicated this"