Panagia Eleousa church dates to the 16th century, and is two aisled, rather than the three which would be more normal for the style of the time. The aisles end in a pair of cylindrical apses. Outside the church are the remains of the monastery which this church once served.
The two aisles are separated by a double archway, with the northern aisle being much smaller than the southern one. This difference in size can also be noticed from the outside in the different dimensions of the windows at the eastern end. The whole of the western end is a later addition, and the join can be seen both externally and internally.
The main door of the church shows Lusignan influences, which explains the lopsided nature of the church. The French Lusignans were Latin Christians, and while not actually banning Orthodox Christianity, treated it as second class. There are other examples in the Middle East where the ruling classes reluctantly allowed the peasants space to worship in their churches. To remind them of their place, the space allocated to the Orthodox Christians was much smaller than that allocated to the Latin Christians.
Although disused, the church continues to be a place of pilgrimage by Orthodox visitors, and it is unusual to visit and not see a lit candle.
References: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.