. ▁ ▁Before ▁the ▁battle ▁of ▁T ap ae ▁( 1 0 1 ) ▁( in ▁the ▁first ▁campaign ▁of ▁Tra jan ) ▁the ▁Da cian ▁tribe , ▁the ▁B uri , ▁sent ▁Tra jan ▁a ▁message ▁to ▁the ▁effect ▁that ▁he ▁should ▁withdraw ▁from ▁D acia ▁and ▁restore ▁peace ful ▁relations . ▁Their ▁message ▁to ▁him ▁was ▁ins cribed ▁on ▁the ▁smooth ▁top ▁of ▁a ▁very ▁large ▁m ush room , ▁in ▁Latin . ▁This ▁message ▁was ▁unusual ▁enough ▁to ▁become ▁part ▁of ▁a ▁fr ie ze ▁on ▁Tra jan ' s ▁Column . ▁ ▁In ▁the ▁ 6 th ▁century ▁a ▁de ed ▁issued ▁by ▁Justin ian , ▁dated ▁ 5 3 0 ▁AD , ▁mentions ▁the ▁B urs : ▁ ▁" In super ▁constitu im us , ▁tib ique ▁dam us ▁h ic ▁descript a ▁arm orum ▁ins ign ia : ▁vid el ic et : ▁sc ut um ▁in ▁sept em ▁part es ▁divis um ; ▁in ▁medio ▁e ius , ▁sc ut um ▁a ure um , ▁cui ▁in est ▁aqu ila ▁du pp lex , ▁al ba ▁et ▁n ig ra , ▁qu ae ▁signific at ▁Em ble ma ▁Imper iale , ▁cui us ▁cap ita ▁coron ata ▁sunt ▁pur p ure o ▁Imperial i ▁dia dem ate , ▁ex ▁parte ▁de xt ra ▁in ▁prima ▁divis ione ▁sc ut um ▁rub rum , ▁in ▁cui us ▁medio ▁vid et ur ▁t urr is , ▁signific ans ▁u tr am que ▁Da ci am , ▁in ▁sec