Drone flight from Hvar island to Scedro Island (2019). I'm not sure, but I think this was the general area where the shipwrecks were discovered.
"Croatian archaeologists have discovered two ancient shipwrecks [trading vessels?] off Šćedro, the islet on the south side of Hvar." Source: Archaeology News Network.
"'The two completely preserved shipwrecks, on which there are no traces of damage or looting, are rare and important finds on the Adriatic', explains archaeologist Saša Denegri from the Conservation Department of the Ministry of Culture."
One of these wrecks was discovered in 2017, the other more recently. Both are Greco-Roman, but that's a catch-all designation that covers a lot of territory.
The history of Hvar Island dates back to the Stone Age Hvar Culture (app. 3500 - 2500 BC) which set up trade routes in the eastern Mediterranean. The Greeks (Illyrians?) colonized Hvar in the 4th century BC and defeated local resistance even though they were apparently vastly outnumbered. Around two centuries later, in a familiar pattern, Hvar fell under the dominion of the expanding Roman Republic:
"Following Roman victory in the Second Illyrian War against Demetrius of Pharos, the island became a part of the Roman Republic in 219 BC and the Greek name Pharos was changed to Pharia. After the fall of the Roman Empire in the west, the island was under the control of the Byzantine or Eastern Roman Empire. The population increased in the Late Antiquity with an abundance of archeological finds. A large number of new villa rustica in Stari Grad Plain and also on the previously vacant eastern shores was built" (Wikipedia)