Seen several lineages relating to Sigehelm on https://gw.geneanet.org, https://www.familysearch.org (Latter Day Saints), https://ancestors.familysearch.org/en/M13P-LCJ/sigehelm-"ethel..., and https://www.familysearch.org/tree/person/details/LLQR-VYG
I can't vouch for the authenticity of these lineages, but they trace Sigehelm's lineage through kings of Kent and Essex starting with Seaxneat Teddasson b358. Sledda of Essex married Ricula and her lineage goes back to Hengist, Hengis's father is given as Wihtgils, and his lineage extends back thirteen generations, no doubt all mythological.
Would anyone like to comment on this?