User blog comment:Hitsuji Mamoru/FGO-style Servant Creation Room/@comment-32526231-20170918145607/@comment-32526231-20170918151551

The Welsh Triads name Bedwyr as "Battle-Diademed", and a superior to Drystan, Hueil mab Caw and even Cei. In the Welsh tradition, Bedwyr, Drisdan and Cei had a lot more promince than Lancelot or Gawain who got the spotlight later. So if you're gonna add that Bedivere(who should be named Bedwyr with aka Bedivere), then he should be SR. Of course, that is, if we go by lore and not DW style rankings which is just a waifu meter

Source: Bromwich, Rachel. Trioedd Ynys Prydein