v ain , ▁Mar quis ▁of ▁Bo is - D or é , ▁a ▁companion - in - ar ms ▁of ▁late ▁king ▁Henry ▁IV ▁of ▁France . ▁Following ▁his ▁so ver eign ▁the ▁mar quis ▁had ▁to ▁ ▁ab jure ▁his ▁Cal vin ist ▁faith ▁and ▁adopt ▁Catholic ism ▁though ▁he ▁secret ly ▁sympath izes ▁with ▁Protest ants . ▁After ▁the ▁king ' s ▁death ▁he ▁retired ▁and ▁went ▁to ▁his ▁castle ▁of ▁Bo is - D or é . ▁The ▁mar quis ▁feels ▁deep ▁love ▁for ▁Laur iane ▁de ▁Be uv re , ▁a ▁daughter ▁of ▁his ▁friend ▁and ▁neighbour , ▁ 3 0 ▁years ▁younger ▁than ▁him . ▁Guillaume ▁d ' Ar s , ▁Syl v ain ' s ▁cousin , ▁introdu ces ▁to ▁him ▁a ▁certain ▁Vill ar éal , ▁a ▁ ▁Spanish ▁no blem an . ▁▁ ▁The ▁second ▁part ▁concentr ates ▁on ▁relations ▁between ▁Bo is - D or é , ▁Laur iane , ▁and ▁Vill ar éal . ▁The ▁latter ▁has ▁found ▁out ▁that ▁the ▁mar quis ▁h ides ▁in ▁the ▁castle ▁tre asures ▁of ▁Protest ants ▁and ▁begins ▁to ▁search ▁for ▁them . ▁Besides ▁Villa real ▁ ▁pays ▁his ▁addresses ▁to ▁Laur iane . ▁Bo is - D or é ▁challeng es ▁him ▁to ▁a ▁du el ▁and ▁k ills ▁him . ▁▁ ▁The ▁third ▁part ▁tells ▁about ▁Mario , ▁an ▁ 1 8 ▁old ▁youth ▁whom ▁the ▁mar quis ▁saved ▁from ▁mer cen aries . ▁Mario ▁has ▁striking ▁res embl ance ▁to ▁mar quis