Originally, it seems to have been used to designate a high priest or priestess of a Sumerian city-state's patron-deity[2] – a position that entailed political power as well.
Earlier Emeg̃ir (the standard dialect of Sumerian) forms can be postulated as *ewen or *emen, eventually dropping the middle consonant and becoming the familiar EN.
[3] The 1350 BC Amarna letters use EN for bêlu, though not exclusively.
The more common spelling is mostly be + li, to make bêlí, or its equivalent.
Most of the uses are in the letter introduction, formulaic addresses to the pharaoh, stating typically to effect: Bodies of the letters also repeat the phraseology of "king" or "my lord", sometimes doubly as in letter EA 34, (using be-li, as bêlu), "The pharaoh's reproach answered", by the king of Alashiya.