Lambert's first appearance was in the document called "Dagome iudex" (ca. 991–92), alongside with his parents and brother Mieszko.
Mieszko's first appearance is in the document "Dagome iudex" (ca. 991/92), alongside with his parents and brother Lambert.
The undated mentioning from 1080 states that (shortly before his death?) "Dago(me)" (assumed to be Mieszko I) gifted his territory to Pope John XV and received his domains from him as a fief in this Dagome iudex, not date, apparently issued shortly before his death, ca.
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1080 is known as Dagome iudex and thus assumed to be one of the earliest Polish legal documents.
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.