Megara Hyblaea is an ancient Greek colony in Sicily It was founded about 728 BC by colonists from Megara in Attica. In 628 the city established a colony at Selinus but in 483 was destroyed by the Syracusan leader Gelon. The city had a brief independent existence in the 4th century BC, when it issued coinage, but is heard of mainly as a fortified place.
Excavations carried on in 1891 led to the discovery of the northern portion of the western town wall, which in one section served at the same time as an embankment against floods. There is also an extensive necropolis, about 1500 tombs of which have been explored, and of a deposit of votive objects from a temple. The harbour lay to the north of the town.
In the mid-seventh century, the city was organised according to a regularised plan. An agora emerged with stoas on its north and eastern sides. This is one of the earliest known agoras.
The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.