▁are ▁covered ▁with ▁pl ates ▁of ▁bronze , ▁cut ▁out ▁in ▁patterns . ▁Those ▁of ▁H ag ia ▁Soph ia ▁at ▁Constantin ople , ▁of ▁the ▁ 8 th ▁and ▁ 9 th ▁century , ▁are ▁wr ought ▁in ▁bronze , ▁and ▁the ▁west ▁doors ▁of ▁the ▁c athedral ▁of ▁A ix - la - Ch ap elle ▁( 9 th ▁century ), ▁of ▁similar ▁manufact ure , ▁were ▁probably ▁brought ▁from ▁Constantin ople , ▁as ▁also ▁some ▁of ▁those ▁in ▁St . ▁Mark s , ▁Ven ice . ▁The ▁bronze ▁doors ▁on ▁the ▁A achen ▁C athedral ▁in ▁Germany ▁date ▁back ▁to ▁about ▁ 8 0 0 ▁AD . ▁Bron ze ▁bapt ister y ▁doors ▁at ▁the ▁C athedral ▁of ▁Florence ▁were ▁completed ▁in ▁ 1 4 2 3 ▁by ▁G hi ber ti . ▁( For ▁more ▁information , ▁see : ▁Co pper ▁in ▁architecture ). ▁ ▁Of ▁the ▁ 1 1 th ▁and ▁ 1 2 th ▁centuries ▁there ▁are ▁numerous ▁examples ▁of ▁bronze ▁doors , ▁the ▁earliest ▁being ▁one ▁at ▁H ild es heim , ▁Germany ▁( 1 0 1 5 ). ▁The ▁H ild es heim ▁design ▁affected ▁the ▁concept ▁of ▁G nie z no ▁door ▁in ▁Poland . ▁Of ▁others ▁in ▁South ▁Italy ▁and ▁Sic ily , ▁the ▁following ▁are ▁the ▁fin est : ▁in ▁Sant ▁Andrea , ▁Am alf i ▁( 1 0 6 0 ); ▁Sal erno ▁( 1 0 9 9 ); ▁Can osa ▁( 1 1 1 1 ); ▁Tro ia , ▁two