Bulgarians
Bulgarians are a Slavic people living in the region which, in ancient times, was called Moesia, which was invaded in 7th century by Slavic tribes that assimilated the local Thracian populations.
They acquired their name from the Turkic tribe of Bulghars which also invaded Moesia in the 7th century AD.
In modern times, many Bulgarians speak a Southern Slavic language which has been deeply influenced by Medieval and Modern Greek, as well as - though in a lesser extent - by Osmanli Turkish. It has many traits in common with Slovenian and Croatoserbian, with which it can sometimes be mutually intelligible, although this is not true of its intelligibility with Western and Eastern Slavic languages.
See also: Bulgaria, Bulgars, History of Bulgaria