Ah, thanks for the pointer! I just Googled and got this explanation: https://www.quora.com/Why-did-it-take-nearly-200-years-to-build-Notre-Dame-when-Hagia-Sophi

Ah, thanks for the pointer! I just Googled and got this explanation: https://www.quora.com/Why-did-it-take-nearly-200-years-to-build-Notre-Dame-when-Hagia-Sophia-took-only-5-years/answer/Pat-Sullivan-32 https://www.quora.com/Why-did-it-take-nearly-200-years-to-bu...