The term 'Of Croesus Kingdom' refers to the ancient kingdom of Lydia, which was ruled by King Croesus in the 6th century BC. Located in what is now western Turkey, Lydia was a powerful and wealthy kingdom that was renowned for its gold and silver coins. It was also known for its advanced engineering and architecture, including the construction of the first bridge over the Halys River. The kingdom eventually fell to the Persian Empire in 546 BC.