Barmecide

https://en.oxforddictionaries.com/definition/Barmecide

 

  • A person who offers benefits that are illusory or disappointing.

    Example sentences

Origin

Early 18th century (as a noun): from Arabic Barmakī, the name of a prince in the Arabian Nights’ Entertainments, who gave a beggar a feast consisting of ornate but empty dishes.