This discovery must have been made by 1100 /B.C./ at the latest probably some years earlier. The Koban-folk realised that steel blades were far superior to those of bronze, and doubtless were anxious to show off their new acquisition before the old folks at home. They may, too, have remembered that the stone from which their neighbours extracted the metal was plentiful in some parts of the old country. Whatever the cause, I believe that some of them returned to Hungary with their new discovery, before bronze swords of Type F had been evolved or at any rate had come into general use. Iron ore, which could easily be worked by primitive methods, occurs in Transylvania, at Gyalar,[395] and it seems likely that it was in this neighbourhood that they first settled. It is also possible that about this time some of them occupied Thrace, for in early days Thracian swords had a great reputation.[396] By degrees they pushed up the Danube, at any rate as far as its junction with the Save. Before 1000 /B.C./ a large number of them advanced up the Morava and down the Vardar and soon afterwards entered Thessaly, whence they started on that series of conquests known as the return of the Heraclids, or the Dorian invasion of Greece.[397] Many of these Koban-folk settled on the southern bank of the Danube and the Save, and in the hill country behind; various cemeteries of this time have been discovered in this region, the most famous of which is that at Glasinatz in Bosnia.[398] Others pushed up the Save, which runs through mountains of an easily worked iron ore; evidence of early workings have been found on the banks of the Mur in Styria and on the upper Drave in Carinthia.[399] A little later, between 1000 and 900 /B.C./, some of these people passed over into Italy. They may have crossed the Adriatic, as did in all probability the men of the leaf-shaped sword, but it is tempting to think that they crossed the Predil pass and settled at Santa Lucia Tolmino, near the head waters of the Isonzo. Here a cemetery was found in 1885,[400] much of the grave furniture from which is, or was in 1914 in the Trieste Museum, while the remainder is in Vienna. More than 1000 graves were found and the cemetery must have been in existence for several centuries; but it is usually believed that the earliest graves date only from the eighth century. Others of the same party crossed the mountains into the rich Friuli plain and settled at Dernazacco, near Cividale,[401] and gradually spread thence over the Veneto.