What century did Shulgi reign for 48 years?
Babylonian calendar The Babylonian calendar was a lunisolar calendar with years consisting of 12 lunar months, each beginning when a new crescent moon was first sighted low on the western horizon at sunset, plus an intercalary month inserted as needed by decree. The calendar is based on a Sumerian (Ur III) predecessor preserved in the Umma calendar of Shulgi (c. 21st century BC).
Llywelyn the Great Llywelyn the Great (Welsh: "Llywelyn Fawr" , ] ), full name Llywelyn ap Iorwerth, (c. 117211 April 1240) was a Prince of Gwynedd in north Wales and eventually "de facto" ruler over most of Wales. By a combination of war and diplomacy he dominated Wales for 45 years.