▁the ▁Orth odox ▁sphere ▁of ▁influence ▁became ▁Orth odox ▁and ▁those ▁who ▁lived ▁under ▁the ▁Catholic ▁sphere ▁of ▁influence ▁became ▁Catholic . ▁ ▁With ▁the ▁arrival ▁of ▁the ▁Ott oman ▁Empire , ▁some ▁Ser bs ▁converted ▁to ▁Islam . ▁This ▁was ▁particularly , ▁but ▁not ▁wh olly , ▁the ▁case ▁in ▁Bos nia . ▁Since ▁the ▁second ▁half ▁of ▁the ▁ 1 9 th ▁century , ▁a ▁small ▁number ▁of ▁Ser bs ▁converted ▁to ▁Protest ant ism , ▁while ▁histor ically ▁some ▁Ser bs ▁were ▁C athol ics ▁( es pecially ▁in ▁Bay ▁of ▁Kot or ▁and ▁Dal mat ia ; ▁e . g . ▁Ser b - C atholic ▁movement ▁in ▁Dub rov nik ). ▁In ▁a ▁personal ▁correspond ence ▁with ▁author ▁and ▁critic ▁dr . ▁Milan ▁Š e vić ▁in ▁ 1 9 3 2 , ▁Mark o ▁Mur at ▁compla ined ▁that ▁Orth odox ▁Ser bs ▁are ▁not ▁acknowled ging ▁the ▁Catholic ▁Ser b ▁community ▁on ▁the ▁basis ▁of ▁their ▁faith . ▁The ▁remainder ▁of ▁Ser bs ▁remain ▁pre domin antly ▁Ser bian ▁Orth odox ▁Christians . ▁ ▁Symbol s ▁ ▁Among ▁the ▁most ▁notable ▁national ▁and ▁eth nic ▁symbols ▁are ▁the ▁flag ▁of ▁Ser bia ▁and ▁the ▁coat ▁of ▁arms ▁of ▁Ser bia . ▁The ▁flag ▁consists ▁of ▁a ▁red - blue - white ▁tr icol our , ▁root ed ▁in ▁Pan - S lav ism , ▁and ▁has ▁been ▁used ▁since ▁the ▁ 1 9 th ▁century . ▁A part ▁from ▁being ▁the ▁national ▁flag , ▁it ▁is