King Sulumeli (the figure on the left) is pouring libation to the Sungod, while Queen Tuwasta (the figure on the right) does the same to the Moon goddess (which is not visible on this picture).
Between the king and the Sungod there is an inscription in hieroglyphic Luwian.
Relief from the Lion Gate of Milid/Arslantepe (7 km northeast of modern Malatya).
Neo-Hittite sculpture in traditional style, 1050-850 BC.

Luwian is an ancient language or group of languages of the Anatolian branch of the Indo-European language family. The two varieties of Luwian are named for the scripts that they were written in: Cuneiform Luwian (CLuwian) and Hieroglyphic Luwian (HLuwian). As to whether these were one language or two, there is no consensus. Luwian is closely related to Hittite.

Correspondent: J.M.Criel, Antwerpen
Sources: ‘Anadolu Uygarlıkları’ (Anatolian Civilisations) – Prof.Dr. Ekrem Akurgal.
& Website of ‘hittitemonuments.com’ .