Matsushima Shrine
Located on a long, narrow island near the mouth of the Usuki River, Matsushima Shrine was founded in 1707.
The three main kami enshrined here are Sokozutsunoo, Nakazutsunoo, & Uwazutsunoo, three kami that were created when Izanagi was purifying himself in water after fleeing from the Underworld.
There is no agreed upon meaning for their names, though they are the three kami that collectively are enshrined at Sumiyoshi shrines. The inclusion of Jingu as a secondary kami further suggests the connection to Sumiyoshi. Why it is a Matsushima shrine and not a Sumiyoshi shrine is not clear to me.
There are other Matsushima shrines so quite probably this was founded as a branch of the main one. Also enshrined here is Sugawara Michizane, Tenjin.