The term 'German King' can be represented by three different crossword solutions: OTTO (4 letters), Otho (4 letters), and KAISER (6 letters). OTTO was the first German king, ruling from 936 to 973. He was the founder of the Holy Roman Empire, which lasted until 1806. Otho was the second German king, ruling from 973 to 983. He was the son of OTTO I and was crowned king at the age of three. KAISER was the title of the German kings from 1871 to 1918. It was derived from the Latin word for emperor and was used to refer to the German emperors of the Second Reich.