"Colonology" is a sensitive subject among writers. Technically, items in a list following a colon are separated by semi-colons (which makes sense, especially in the case of phrases or clauses). In your case, that seems a bit too much.
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cboutin3After lifting the siege of Storm’s End, Eddard Stark journeyed to the tower with six companions: Howland Reed, Willam Dustin, Ethan Glover, Martyn Cassel, Theo Wull, and Mark Ryswell.This looks fine to me.