Unpopular opinion, but it has to be Maxwell. Lionel had Derby at heart and provided some great times but Robert saved the club from being wound up and disappearing (approx 2 million to the taxman among others I think).
He also hired Arthur Cox and paid for Shilton, Wright, Tin Man, Saunders, Williams, Bobby, and we went from 3rd div to 5th in the (old) 1st div.
And when he did turn up he would land his helicopter in the Shaftesbury playing fields!
Was clearly a massive 🔧 though and it didn’t end too well, for anyone concerned.