Ikalto monastery was founded by Saint Zenon, one of the 13 Syrian Fathers, in the late 6th century. It was known as one of the most significant cultural-scholastic centres of Georgia. An academy was founded at the monastery during king David the Builder by Arsen Ikaltoeli (Ikaltoeli meaning from Ikalto) in the early 12th century. The Academy of Ikalto trained its students in theology, rhetoric, astronomy, philosophy, geography, geometry chanting but also more practical skills such as pottery making, metal work, viticulture and wine making and pharmacology. According to a legend the famous 12th century Georgian poet Shota Rustaveli studied there.
There are three churches on the monastery grounds – Khvtaeba, Kvelatsminda and Sameba. The main church, Khvtaeba (Holy Spirit), was built in the 8th–9th century on the site of an older church (in which Saint Zenon had been buried). In 1616 the Persian invaders led by Shah Abbas I set the Ikalto Academy on fire and it ceased to exist.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.