culture (named after the city of Vinkovci) is recognizable by its bronze fibulas that replaced previous objects like bone needles and buttons. The Bronze culture of the Illyrians, ethno-tribal groups with distinct cultures, and art forms started to emerge from the cultures of the Copper Age. These Illyrian ethno-tribal areas were found in present-day Croatia, and Bosnia and Hercegovina. From the 7th Century BC, iron replaced bronze for tools and implements, only jewellery and art objects were still made out of bronze. The Celtic Hallstatt culture which bordered the Balkan region where the Illyrian ethno-tribal groups were living influenced them, but the Illyrian ethno-tribal groups formed their regional centers slightly differently. In the northern Balkan Peninsula, the Illyrian ethno-tribal groups had the cult of the dead, as evidenced from the richness of and care for burial sites, from which burial ceremonies are deduced. These burial sites show a long tradition of cremation and burial in shallow graves. In the southern Balkan Peninsula, the Illyrian tribes buried their dead under large heaps stone, or earth tumuli (known locally as gromile). The Illyrian Iapydes (or Japodes) tribes had an affinity for decoration with heavy, oversized necklaces made with yellow, blue or white glass paste and they are known for their large ornamented bronze fibulas, spiral bracelets, diadems, and helmets made out of bronze. Small sculptures of jade made from the archaic Ionian plastic are also found in Japodian tribal areas. Numerous monumental sculptures are preserved, as well as walls of a citadel called Nezakcij near present-day Pula, one of the numerous Istrian cities from Iron Age. Arrival of the Celts The 4th century BC saw the first Celts arrive into the Illyrian areas of the Balkans; with them they brought the technique of the pottery wheel, new styles of fibulas and different bronze and iron belts, which the local Illyrian tribes had not previously developed. The Celts also mixed with the Illyrian tribal groups in Slavonia, Istria, and Dalmatia. Antiquity Greek colonies Greek sailors and merchants from the Greek City States of the south of the Balkan peninsula reached almost every part of Mediterranean including the Adriatic Sea coast of present-day Croatia. Other Greeks came from Syracuse on Sicily in 390 BC to the islands of Vis (Issa), Hvar (Pharos), and Korčula (Corcyra Nigra) founding city-states amongst the Illyrian ethno-tribal groups. Trading cities were founded on the Adriatic Coast such as Tragurion