Gytheio was the seaport of Ancient Sparta. It is the site of ancient Cranae, a tiny island where, according to the myth, Paris and Helen spent their first night together before departing for Troy.
In Roman times Gythium remained a major port and it prospered as a member of the Union. As purple dye was popular in Rome, Gythium exported that as well as porphyry and rose antique marble. Evidence of the ancient Gythium prosperity can be found by the fact that the Romans built an ancient theatre which is well preserved today and is still used occasionally. The ancient theatre and the city's Acropolis (west of the theatre) were discovered by the archeologist Dimitris Skias in 1891. Some time in the 4th century AD, the city was destroyed. What happened to Gythium is not recorded but it is thought to have been either sacked by Alaric and the Visigoths, pillaged by the Slavs or destroyed by the massive earthquake that struck the area in 375 AD.
After the earthquake Gythium was abandoned. It remained a small village throughout the Byzantine and Ottoman times. Its importance grew when Tzannetos Grigorakis built his tower at Cranae and more people came and settled at Gytheio. During the Greek War of Independence, refugees flooded into Mani and made Gytheio a major town.
References:The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.