The city was located on the western slopes of Mount Othrys, some 4 km southwest of the modern village of Xyniada (in the Phthiotis Prefecture).

[3] The medieval town is mostly known as a bishopric (attested since 879), being featured in the Notitiae Episcopatuum until well into Ottoman times.

By 1212 the see was vacant, and Pope Innocent III gave the bishopric to the bishop of nearby Zetounion (Lamia).

[3] The town returned under Greek control soon after that, and in 1250, its bishop, a certain John Xeros, became Metropolitan of Nafpaktos.

[3] As of the nineteenth century, William Smith remarked that the site of the ancient city was marked by some remains of ruined edifices upon a promontory or peninsula in Lake Xynias,[4] a site now called Koromilia[5] or Nisi.