The area was inhabited by neolithic farmers during the First Agricultural Revolution. The first inhabitants of the region were the Kakanj, who were later replaced by a different neolithic people, the Butmir. The largest Butmir site is in Okolište, near Visoko, and in its time it numbered between 1000 - 3000 inhabitants. Okolište is one of the largest neolithic settlement in the southeast Europe. Some of the first Indo-Europeans are thought to be members of eneolithic Vučedol culture which flourished between 3000 and 2200 BC.