The castle was quite large and its shape was adapted to the reef on which it was located. It consisted of two main parts. The original castle core was located on the highest SE part of the ridge and had dimensions of approximately 50 x 30 m. Small discontinuous remains of above-ground walls have been preserved, but the remnant of a regularly shaped building is clear. Access to the core was from the NW through the neck ditch, which separates it from the fort, which occupied the entire remaining area of the top ridge in the length of almost 130 m.Towards the SW, the rest of the prismatic bastion has been preserved. NW in the direction from the upper castle stretches a lingual rocky outcrop, on which artificial interventions can be seen. There is a moat at the NW end of this fort. Another lingual promontory stretches south-west and was fortified by a wall with a cylindrical bastion at the end of the promontory, which controlled the entrance to the castle. The lower SW extends from the cylindrical bastion to a tongue-shaped outcrop, where parallel ramparts that are three times transversely divided are noticeable. The whole system extends to the end of the protrusion, where it ends in the form of a platform. The protection of this unit on the western side was further strengthened by the now insignificant rampart.At present, in addition to the ramparts, the disposition of the castle in the terrain is visible and the relic of the access road in the bend below the NW fort is partially preserved. A fragment of the masonry of the NE wall, the adjacent northern corner and the destroyed SE masonry - which formed the tower - was also preserved. The ground floor fragment of the masonry is probably the remnant of a prismatic bastion.

Historians differ on the time of the castle's founding. According to P. Križko, the origin of the castle can be dated before 1240, when there was a village and a castle called Brezinche, while after the Tartar invasion only Berzenche Castle is mentioned. According to this theory, the foundation of the castle can be attributed to the Archbishop of Esztergom, who in 1260 took over the village of Breznica from the abbot of St. Benedict, and because of this, disputes arose.

Another source (Vlastivedný slovník obcí na Slovenskou, p. 153) considers the first credible report on Breznica Castle to a document from 1311 and the Hungarian historian E. Fügedi marked the origin of the castle in the range of 1283 to 1311, because in 1283 the castle is not yet mentioned.

The castle then became the property of Matúš Čák, who occupied it in 1311. The advantageous location of the castle enabled the control of the Hron valley, where important roads led, especially to the mining areas. It is said that Čák used the sapper technique, which consisted in the attacker undermining the castle walls, which then collapsed. However, the castle then had to be repaired relatively quickly, as in 1313 it is already mentioned as a castrum egregium, ie an important castle. Čák held the castle for about 10 years and after his death he returned to the archbishop.

It is believed that the archbishop's disputes with the abbey continued, which is probably related to the damage to the castle, which is mentioned in 1411 as a castrum fractum, ie damaged.

In 1423, the castle was rebuilt into a Gothic fortress. It had a prismatic tower with a residential palace, with external fortifications, which enclosed the castle courtyard.

After the death of King Albrecht II. the castle was occupied by the troops of Ján Jiskra in 1441 and later, in 1471 by the army of the Polish king Kazimir. According to other sources, however, Mikuláš Bodok, the captain of Breznica, invited the Czechs to the castle in 1464, ravaging the area with them. It was at the time of the conspiracy against Matej Korvín. After the suppression of the uprising by king Matej, the castle fell into royal hands, led by the castellan Bartoš of Hertvikoviec (Barhos de Herthquikovyer). Probably due to military events, however, the importance of the castle has declined. This follows from the record from 1475, when it is mentioned as a fortress - forthalitium.

The complete demise of the castle can be expected at the end of the Middle Ages, because when planning the anti-Turkish defense in the parliament in 1564, only one of the proposed guard posts is mentioned as the site of the old castle above Breznica.

Despite this information, Ján Bornemisza, without specifying the source of the information, claims that in In 1660 the castle still stood. Although it was damaged, but was still habitable. Slovak list of monuments (Súpis pamiatok) states that the castle lasted until the beginning of the 18th century and that after 1711 did not even demolish. At that time, however, the castle was probably in ruins. Later, the stones were used to build houses in the village, which significantly accelerated the process of demise of the building.

At present, in addition to the ramparts, the layout of the castle in the terrain is visible, the relic of the access road, a fragment of the masonry of the north-eastern wall and the destroyed SE masonry are partially preserved. A fragment of masonry has also been preserved, which is probably the remnant of a prismatic bastion.

How Breznica Castle was conquered by Matúš Čák

Once, when enemy troops were recharging Breznica Castle, a handsome soldier, a spy, seduced the castle maid. He promised her a marriage for her help in recharging the castle. With a vision of a free future, the girl agreed and did as her soldier told her. To launch the attack, she lit a candle in a clearly visible place and hid well so that nothing would happen to her. The attackers began to undermine the castle. Suddenly a terrible explosion erupted and part of the wall collapsed. The castellan and his family and party escaped an underground passage. The attackers defeated the castle garrison and became masters of the castle.The handsome soldier almost found the dragon girl. When he left, he took him with him, according to the military word. However, the act did not go unpunished. A quarrel broke out between them, in which the soldier became so angry that he killed the girl. Perhaps that is why it is not recommended to visit this place after dark today, as the cursed girl is allegedly haunting here. Was she the traitor herself?

The ruins are freely accessible

https://www.hrady-zamky.sk/breznicky-hrad/