, ▁separate ▁strateg oi ▁of ▁Th race ▁are ▁not ▁clearly ▁att ested ▁in ▁literary ▁sources ▁until ▁ 7 4 2 , ▁while ▁se als ▁of ▁strateg oi ▁are ▁also ▁ext ant ▁only ▁from ▁the ▁e ighth ▁century ▁on . ▁Initial ly , ▁Ad rian ople ▁was ▁probably ▁the ▁theme ' s ▁capital . ▁ ▁Under ▁Em press ▁I rene ▁of ▁Ath ens , ▁in ▁the ▁late ▁e ighth ▁century , ▁the ▁theme ▁was ▁divided , ▁with ▁the ▁western ▁part ▁being ▁constit uted ▁as ▁the ▁separate ▁theme ▁of ▁Mac ed onia . ▁From ▁then ▁on , ▁the ▁theme ' s ▁capital ▁was ▁at ▁Arc adi opol is , ▁with ▁sub ordinate ▁tour m arch ai ▁at ▁B iz ye ▁and ▁So z opol is . ▁Another , ▁called ▁tour m arch es ▁t es ▁Th rak es ▁(" of ▁Th race ") ▁is ▁also ▁att ested , ▁possibly ▁the ▁strateg os ''' ▁deput y ▁at ▁Arc adi opol is . ▁The ▁Arab ▁ge ograph ers ▁I bn ▁Kh ord ad be h ▁( w rote ▁ca . ▁ 8 4 7 ) ▁and ▁I bn ▁al - Fa q ih ▁( w rote ▁ca . ▁ 9 0 3 ) ▁mention ▁the ▁theme ▁as ▁extending ▁" from ▁the ▁long ▁wall ▁[ the ▁An ast as ian ▁Wall ]" ▁to ▁the ▁theme ▁of ▁Mac ed onia , ▁and ▁north ▁up ▁to ▁the ▁country ▁of ▁the ▁Bulg ars , ▁counting ▁ 1 0 ▁fort ified ▁places ▁and ▁ 5 , 0 0 0 ▁troops . ▁Indeed