Petrusse Casemates origin goes back to 1644, when the Spaniards reinforced the medieval fortifications. Under the supervision of the Swiss fortress builder Isaac von Treybach, they built - among other defence works-the powerful Beck Bastion, named after Governor Baron Johann von Beck, a native of the city who had played a key role in the Wallenstein affair on the side of the Emperor. Initially this bastion was as high as the adjacent terraces on the right; it was raised to the present level of Constitution Square (the wall is 27 meters high) by Vauban in 1685.
In 1673 the Spaniards erected the so-called 'Ravelin du Pate' to strengthen the defence of the Beck Bastion; this triangular construction is one of the few well-kept fortifications. Marshall de Vauban conferred the present shape to all the Petrusse fortifications and built the 'Small Staircase'. From 1728-29 the Austrians added the 'Bourbon Lock' and the 'Large Staircase' and in 1746 the casemates of the 'Petrusse Battery' (54 gun emplacements).
One century passed and the fortress was enlarged and reinforced: the second ring was extended and the third started, so that Luxembourg became the 'Gibraltar of the North'. By and by, the Petrusse fortifications fell into oblivion and neglect, as their strategic momentum limited itself to the valley. After the dismantling, stipulated by the 1867 London Treaty, they confined themselves to walling up the loopholes and most entrances. In 1933 the Petrusse casemates were opened to the public.References:
Fisherman's Bastion is a terrace in neo-Gothic and neo-Romanesque style situated on the Buda bank of the Danube, on the Castle hill in Budapest, around Matthias Church. It was designed and built between 1895 and 1902 on the plans of Frigyes Schulek. Construction of the bastion destabilised the foundations of the neighbouring 13th century Dominican Church which had to be pulled down. Between 1947–48, the son of Frigyes Schulek, János Schulek, conducted the other restoration project after its near destruction during World War II.
From the towers and the terrace a panoramic view exists of Danube, Margaret Island, Pest to the east and the Gellért Hill.
Its seven towers represent the seven Magyar tribes that settled in the Carpathian Basin in 896.
The Bastion takes its name from the guild of fishermen that was responsible for defending this stretch of the city walls in the Middle Ages. It is a viewing terrace, with many stairs and walking paths.
A bronze statue of Stephen I of Hungary mounted on a horse, erected in 1906, can be seen between the Bastion and the Matthias Church. The pedestal was made by Alajos Stróbl, based on the plans of Frigyes Schulek, in Neo-Romanesque style, with episodes illustrating the King's life.