The historic area includes the Ključ fortress, the Podključ castle town (in Serbo-Croatian: podgrađe, lit.

At that time, Radassin Stanchouich de Sotocliuç undertook a four-year service and studied crafts with the weaver Vlakota Mihačević.

[5] It is not explained why Ključ is not mentioned in the first charter of the Aragonese-Neapolitan king Alfonso from 1444 when the estates of Stjepan Kosača are confirmed.

Supervising the neighbouring Cernica (an old settlement from the time of the Roman Empire), the city observed the movement of the most important trade route, Dubrovnik-Goražde.

Stjepan Tomašević succeeded his father on the throne of Bosnia following the latter's death in July 1461 and became the first Bosnian (and last) king to receive a crown from the Holy See.

At the end of 1465, Kosača asked the government of Dubrovnik for emergency supplies and support for the besieged fortress.

[6] On 21 May 1466, an old and terminally ill duke Stjepan dictated his last words, recorded in a testament, and bypassing Vladislav he condemned him by saying that it was him who "brought the great Turk to Bosnia to the death and destruction of us all".

Vlatko tried one more push to the heart of Bosnia, however now abandoned by his allies his venture ended in disaster, after which he completely and finitely withdraw to his fortress in Novi.

In the 16th century, several foreigners, including Venetian Benedetto Ramberti in 1533 travelled from Dubrovnik via Ključ, and noted the fortress was destroyed.

On the hill Ćućenica south of the city there are stećak tombstones from the medieval period, some of which have been transferred to the National Museum.