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The golden era of the golden number was the Italian renaissance.

The expression divine proportion was coined by the great mathematician Luca Pacioli in his book 'De divina proportione', written in 1509.

@ integral life +

Divina proportione

Written by Luca Pacioli
Printed by A. Paganius Paganinus.
( Venice; 1509).

Take a look at the digitised copy of the Divina proportione