▁S iles ia , ▁Austria , ▁Ty rol ▁and ▁Sloven ia . ▁Its ▁glass - m akers ▁proved ▁their ▁art istic ▁skills ▁and ▁techn ological ▁experience ▁in ▁Brandenburg , ▁Sax ony , ▁Th uring ia , ▁Bav aria , ▁St y ria , ▁Slov ak ia , ▁Cro atia ▁and ▁so ▁on . ▁The ▁well - known ▁glass ▁artist ▁Friedrich ▁Eg ermann ▁also ▁ranked ▁among ▁the ▁family ’ s ▁descend ants ▁as ▁the ▁ ▁natural ▁historian ▁and ▁expl orer ▁of ▁South ▁America ▁Th add ä us ▁Ha en ke . ▁ ▁Bibli ography ▁▁ ▁Walter ▁A . ▁Friedrich : ▁Die ▁W urz eln ▁der ▁nord b ö hm ischen ▁Glas indust rie ▁und ▁die ▁Glas m acher famil ie ▁Friedrich . ▁Für th ▁( G erm any ) ▁ 2 0 0 5 , ▁published ▁by ▁the ▁author . ▁ ▁See ▁also ▁▁ ▁Ost s ied lung ▁ ▁Sud eten ▁Germ ans ▁ ▁External ▁links ▁▁ ▁The ▁roots ▁of ▁the ▁Northern ▁Boh em ian ▁glass ▁industry ▁and ▁the ▁glass - maker ▁family ▁Friedrich ▁ ▁Die ▁Friedrich ▁- ▁Glas m acher ▁in ▁Nord b öh men ▁German ▁Website ▁ ▁Category : G lass ▁art ▁Category : History ▁of ▁glass ▁Category : G lass ▁mak ers ▁Category : G erman ▁Boh em ian ▁people ▁ ▁Category : G erman ▁families <0x0A> </s> ▁The ▁Cit adel ▁of ▁Ale ppo ▁() ▁is ▁a ▁large ▁medieval ▁fort ified ▁palace ▁in ▁the ▁centre ▁of ▁the ▁old ▁city ▁of ▁Ale ppo , ▁northern ▁Sy ria . ▁It ▁is ▁considered ▁to