▁a ▁month ▁after ▁his ▁father . ▁ ▁Since ▁he ▁was ▁Je ong ▁Y ak - j ong ' s ▁younger ▁brother , ▁Je ong ▁Y ak y ong ▁was ▁sent ▁into ▁ex ile ▁for ▁some ▁months ▁in ▁J ang gi ▁for tr ess ▁in ▁what ▁is ▁now ▁P oh ang , ▁having ▁been ▁found ▁after ▁inter rog ation ▁with ▁tort ure ▁not ▁to ▁be ▁a ▁Catholic ▁bel ie ver . ▁That ▁might ▁have ▁been ▁that , ▁but ▁what ▁brought ▁Y ak y ong ▁to ▁Gang jin , ▁where ▁he ▁was ▁forced ▁to ▁spend ▁eigh teen ▁years , ▁was ▁the ▁event ▁that ▁served ▁as ▁the ▁final ▁n ail ▁in ▁the ▁coff in ▁of ▁the ▁early ▁Catholic ▁community , ▁the ▁Sil k ▁Let ter ▁Inc ident . ▁H w ang ▁Sa - ye ong , ▁married ▁to ▁one ▁of ▁Das an ' s ▁younger ▁sister s , ▁hid ▁in ▁a ▁cave ▁during ▁the ▁per sec utions ▁and ▁in ▁October ▁ 1 8 0 1 ▁he ▁finished ▁writing ▁a ▁long ▁letter ▁to ▁the ▁bishop ▁of ▁Be ij ing , ▁giving ▁a ▁detailed ▁account ▁of ▁the ▁recent ▁events , ▁asking ▁him ▁to ▁bring ▁pressure ▁on ▁the ▁Korean ▁authorities ▁to ▁allow ▁freedom ▁of ▁religion ▁and , ▁dis astr ously , ▁begg ing ▁him ▁to ▁ask ▁the ▁Western ▁nations ▁to ▁send ▁a ▁large ▁army ▁to ▁over throw ▁the ▁Jose on ▁dynast y ▁so ▁that ▁Korea ▁would ▁be ▁subject ▁to ▁China , ▁where ▁Catholic ism ▁was ▁permitted . ▁The ▁man ▁carrying ▁this ▁letter , ▁written ▁on ▁a ▁roll ▁of ▁sil