Moravia was built on the fringes of the Karakas Desert in 407 as the front-line defense against the City-State of Jowston, along with the Fortresses of Duha and Rakan. The castle was built in a very pragmatic fashion, built with high stark walls and so lacked the frills and ornate work present in other castles. It also had monsters roaming the halls for additional security purposes.
Kasim Hazil was the lord of Moravia during the Gate Rune War, succeeding Teo McDohl as protector of the north following the latter's death. The castle was infiltrated by the Toran Liberation Army during the war to free Viktor and noted rebel sympathizer Warren from captivity. Kasim Hazil surrendered the castle without a fight when the Jowston army was manipulated into invading the region while Moravia's forces were assisting the beleaguered Duha and Rakan fortresses, cutting the castle off from any possible rescue.
Following the war, Kasim Hazil returned to Moravia to continue protecting the northern border.
Moravia's theme in Suikoden is the song "Gate", which is song 16 on disc 2 of the Genso Suikoden Original Game Soundtrack. Its interior track, befitting its role in the plot, is the song "Intrusion", which is song 20 on disc 1 of the same soundtrack.
Moravia shares "Gate" as its theme with most "fortress"-style locations throughout the game, including the Fortress of Kwaba, Pannu Yakuta Castle, the Fortress of Garan, the Fortress of Lorimar, the Northern Checkpoint, and the Floating Fortress of Shasarazade.