▁could ▁have ▁happened ▁in ▁the ▁Francis can ▁church ▁in ▁O pole . ▁ ▁After ▁he ▁died ▁un mar ried ▁and ▁child less , ▁his ▁younger ▁brothers ▁Jan ▁II ▁the ▁Good ▁and ▁Nicholas ▁II ▁assumed ▁the ▁government ▁over ▁O pole ▁as ▁co - r ul ers , ▁but ▁later ▁in ▁that ▁year ▁they ▁decided ▁to ▁make ▁the ▁division ▁of ▁their ▁domains . ▁ ▁References ▁ ▁Chron ological ▁D ates ▁in ▁Sto yan ▁Gene al ogy ▁of ▁D uk es ▁of ▁O pole ▁ ▁| - ▁ ▁| - ▁ ▁| - ▁ ▁Category : 1 4 5 0 ▁birth s ▁Category : 1 4 7 6 ▁death s ▁Category : Pol ish ▁Roman ▁C athol ics ▁Category : Pi ast ▁dynast y <0x0A> </s> ▁Arnold ▁S ny der ▁is ▁a ▁professional ▁g amb ler ▁and ▁g amb ling ▁author . ▁He ▁was ▁elected ▁by ▁professional ▁black jack ▁players ▁as ▁one ▁of ▁the ▁seven ▁original ▁induct ees ▁into ▁the ▁Black jack ▁Hall ▁of ▁Fame ▁which ▁is ▁hosted ▁at ▁Bar ona ▁Cas ino ▁for ▁his ▁record ▁as ▁a ▁black jack ▁player ▁and ▁his ▁innov ations ▁in ▁professional ▁g amb ling ▁techniques . ▁He ▁was ▁the ▁first ▁black jack ▁authority ▁to ▁publish ▁the ▁importance ▁of ▁deck ▁pen etr ation ▁( depth ▁of ▁the ▁deal ) ▁in ▁card ▁counting , ▁in ▁his ▁ 1 9 8 0 ▁book ▁The ▁Black jack ▁Formula . ▁He ▁was ▁also ▁the ▁first ▁black jack ▁research er ▁to ▁publish ▁( in ▁Black jack ▁Forum , ▁ 1 9 8 1 – 1 9