▁and ▁its ▁territory ▁correspond ed ▁to ▁the ▁medieval ▁Kingdom ▁of ▁O ss ory . ▁In ▁historic ▁times , ▁Kil ken ny ▁replaced ▁Ag hab oe ▁as ▁the ▁chief ▁church ▁in ▁Os ra ige . ▁ ▁The ▁kingdom ▁was ▁bounded ▁by ▁two ▁of ▁the ▁Three ▁Sister s ▁the ▁rivers ▁Bar row ▁and ▁Su ir ▁and ▁the ▁northern ▁limit ▁was , ▁generally , ▁the ▁Sl ieve ▁Blo om ▁Mountains . ▁ ▁The ▁Os ra ige ▁— the ir ▁name ▁means ▁people ▁of ▁the ▁de er — ▁inhab ited ▁much ▁of ▁modern ▁County ▁Kil ken ny ▁and ▁parts ▁of ▁neighbour ing ▁County ▁La ois . ▁To ▁the ▁west ▁and ▁south , ▁Os ra ige ▁was ▁bounded ▁by ▁the ▁River ▁Su ir , ▁to ▁the ▁east ▁the ▁waters hed ▁of ▁the ▁River ▁Bar row ▁marked ▁the ▁boundary ▁with ▁Le in ster , ▁and ▁to ▁the ▁north ▁it ▁extended ▁into ▁and ▁beyond ▁the ▁Sl ieve ▁Blo om ▁Mountains . ▁ ▁The ▁River ▁N ore ▁ran ▁through ▁the ▁Kingdom . ▁ ▁Os ra ige ▁formed ▁the ▁eastern most ▁part ▁of ▁the ▁kingdom ▁and ▁province ▁of ▁Mun ster ▁until ▁the ▁middle ▁of ▁the ▁ 9 th ▁century , ▁after ▁which ▁it ▁was ▁attached ▁to ▁Le in ster . ▁Os ra ige ▁was ▁largely ▁a ▁buffer ▁state ▁between ▁Le in ster ▁and ▁Mun ster . ▁Its ▁most ▁significant ▁neighb ours ▁were ▁the ▁Lo í g si , ▁U í ▁Che in ns ela ig ▁and ▁U í ▁B air c che ▁of ▁Le in ster ▁to ▁the ▁north ▁and ▁east ▁and