Lambert's first appearance was in the document called "Dagome iudex" (ca. 991–92), alongside with his parents and brother Mieszko.
Christopher Lambert | Adam Lambert | Paul Lambert | Lambert | Woluwe-Saint-Lambert | Lambert Simnel | Drexel Burnham Lambert | Andrew Lambert | Kit Lambert | Johann Heinrich Lambert | George Washington Lambert | George Lambert | Warner–Lambert | John Lambert | Constant Lambert | Mary Lambert | Lambert Wilson | Lambert Wickes | Lambert of Hersfeld | Lambert Meertens | Constantin Wilhelm Lambert Gloger | Yvon Lambert | St. Lambert | Saint-Lambert, Calvados | Richard S. Lambert | Richard Lambert | Mieszko Mieszkowic | Malet Lambert High School | Lambert W function | Lambert Township, Red Lake County, Minnesota |
Mieszko's first appearance is in the document "Dagome iudex" (ca. 991/92), alongside with his parents and brother Lambert.
Świętopełk is only named in the chronicles of Thietmar of Merseburg; he was omitted in the document "Dagome iudex" (ca. 991/92), were are named his parents and full-brothers Mieszko and Lambert, a fact who indicated that he maybe was dead by that time, in or before 991.