Research co n d u c ted in Wroclaw cathedral in 1 9 9 6 d isclo sed remnants o f four ston e b uildings, pre ced in g the extan t thirteenth— four teenth -c en tu ry brick edific e. U p on the basis o f those m on um en ts it w as p ossible to recreate the ou tlin es o f original plans, starting w ith the cathedral o f b ishops Walter and Z y ro slaw from the se con d half o f the twelfth century, fo llow ed by the cathedral o f king Kazimierz the Restorer from the se con d half o f the e lev en th century, the cathedral o f king B o le slaw the Brave from about 1 0 0 0 , and a church erec ted on a plan o f a cross from the last quarter o f the e lev en th century. Th e unea rthed relics are featured in an u n d erg rou n d interior situ a ted b e low the presbytery. T he tem p o ra l framewo rk o f the e x h ib itio n is c om p o sed o f a partial and sym b o lic ou tlin e o f the tw e lfth -c en tu ry crypt. This b ackdrop serves a display o f remnants o f the foun d a tion walls o f th e four above m en tio n ed buildin g s as w ell as fragments o f th e flo o r and a r ch ite c ton ic detail. Suitably illum in a ted , the e x h ib itio n , surrounded by a gallery en ab lin g a stead y flow o f visitors, is a valuable h istorical d o cum en t for the app ro a ch in g thousandth anniversary o f the fo u n d in g o f the cathedral, to be com m em o ra ted in the year 2 0 0 0 .