Bengt „Snivil“ Folkesson - again COA without source

Bengt „Snivil“ Folkesson is my 22nd great grandfather.
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You Ingrida Cinkmane (Dzelvite)
→ Elza Dzelvite (Grahpe,Grāpe)
your mother → Jānis Grāpe(Grahpe)
her father → Baron Arnold Julius von Vietinghoff-Riesch
his father → Carl Arnold Bar. von Vietinghoff
his father → Reinhold Johann Peter von Vietinghoff
his father → Augusta Christiane Isabella Elisabet von Vietinghoff
his mother → Reinhold Gustaf von Ungern-Sternberg
her father → Reinhold VII (Renaud) von Ungern-Sternberg
his father → Helene Zoege von Manteuffel
his mother → Helena Henriksdotter Horn af Kanckas
her mother → Anna Jönsdotter Snakenborg
her mother → Jöns Ulfsson Snakenborg (Bååt)
her father → Riksråd Ulf Henriksson Snakenborg
his father → Elin Ulfsdotter (Roos af Ervalla)
his mother → Ulf Pedersson (Roos af Ervalla)
her father → Peder Ulfsson
his father → Ulv Jonsson (Roos af Ervalla)
his father → Birgitta Knutsdotter (Torgils Knutssons ätt)
his mother → Knut Magnusson (Torgils Knutssons ätt)
her father → Magnus Knutsson (Torgils Knutssons ätt)
his father → NN Sigtryggsdotter Boberg
his mother → Kristina Magnusdotter Folkunga
her mother → Magnus Bengtsson Minnesköld (Folkungaätten)
her father → Bengt „Snivil“ Folkesson
his father

What do you know.nothing what so ever

Once again someone tagged this person with a COA which has no support of sources whatever

zzzzz

There seems to be no knowledge of his personal CoA. He was mentioned by Saxo Grammaticus.

One of his claimed sons, Birger Brosa, had a Red shield with a Lily in Silver.
An another son, Magnus Minnesköld, had a Blue shield with a Rampant Lion in Gold.
Here are some links, mostly available in swedish only:

https://www.adelsvapen.com/genealogi/Folkunga%C3%A4tten
http://runeberg.org/nfbh/0440.html
http://runeberg.org/nfbb/0717.html

Perhaps this Rampant Lion should be removed as there are no sources to confirm it as used by him.

Do you have a source for the claim "An another son, Magnus Minnesköld, had a Blue shield with a Rampant Lion in Gold"? As far as >I know, no COA for Magnus Minnesköld is known