Tvrdalj Castle (Croatian: Gradina Tvrdalj) is a castle in Stari Grad, on the island of Hvar, Croatia.
Tvrdalj was the summer residence of Petar Hektorović, the Croatian poet (1487–1572). During the 16th century, the island of Hvar came under attack from the Ottoman Turks. Hektorović, one of the local nobles, undertook to fortify his house so that it could act as shelter for the local citizens.
Tvrdalj is a well-preserved Renaissance building, with a long closed facade on the seaward side, to protect it from attack. The interior courtyard contains a sea-water fishpool, enclosed by a vaulted and arcaded terrace. Next to it is a tower with a dovecote. The living quarters, together with the servant quarters, and several wells, are arranged around the pool. Behind the main buildings is a walled garden where Hektorović cultivated herbs and medicinal plants.
A series of inscriptions are set into walls of the mansion in Latin and Croatian. Those in Croatian are considered to be some of the oldest extant.
PETRVS HECTOREVS MARINI FILIVS
PROPRIO SVMPTV ET INDVSTRIA
AD SVVM ET AMICOR, VSVM CONSTRVXIT
Translation: Petar Hektorović, son of Marin, built this at his own expense and by his own efforts, for his own and his friends' use.
In 1448, Hektor Hektorović was granted permission by the Hvar Governor (Hvarski Knez) to build on the land at Tvrdalj, at the far western edge of the town of Stari Grad, right on the shore of the bay. The location was already known as Tvrdalj which translates as a fortress or castle, implying an earlier fortification on the site. The area had been the site of occupation from ancient times, as demonstrated later by remains found during the 1898 excavations for the steps of the nearby church of Sv Rocco.
The late 15th century and into the 16th century was a time of expansion and building in Stari Grad. In 1482, the Dominican monastery was built, and many of the noble families on the island saw Old Hvar, as it was then called, as a peaceful haven. Many eminent figures had summer palaces built, so much so that in 1553 the Venetian correspondent Giustinian described Stari Grad as having "handsome buildings and a port fit for the largest of ships. Many fine people live there."