[crygin]

That you know of -- it's possible he was secretly married, and his secret wife was sleeping with the likely first winner of a Nobel prize in mathematics.

Unlikely, yes, but the tale is not certainly apocryphal ;)

[rurban]

He had no secret wife, but 3 non-secret official affairs. The last one with Sophie Hess lasting for 18 years, in which she had a second lover. https://oe1.orf.at/programm/20190122/540398/Die-geheimen-Lie...

The rumor is that his first love interest in Russia Anna Desry preferred the mathematician Franz Lemarges.

[nl]

https://simanaitissays.com/2018/08/23/on-alfred-nobel-and-go... and https://simanaitissays.com/2018/08/24/on-alfred-nobel-and-go... is possibly a better reference here.

[rytill]

Google gives the following definition of apocryphal:

> (of a story or statement) of doubtful authenticity, although widely circulated as being true.

So it seems to be certainly apocryphal.