The term RULER OF THE AESIR can be solved by the four-letter word ODIN. ODIN is a major deity in Norse mythology and is the chief of the Aesir gods. He is associated with wisdom, healing, death, royalty, the gallows, knowledge, battle, sorcery, poetry, frenzy, and the runic alphabet. He is also known as the Allfather, as he is the father of all the gods. ODIN is often depicted as a one-eyed man with a long beard and wearing a cloak and a wide-brimmed hat. He is also often accompanied by two ravens, Huginn and Muninn, who fly around the world and bring him news.