Klaus was born about 1395, the son of Claus Clausson Slaveka and Märta Ingemundsdotter Vasa. The place is not known.
His wife was Bengta Johansdotter Schack, who he married in ABT 1425. The place has not been found. Their only known child was Johan Klausson (c1430-?).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | ABT 1395 |
|