Deaths on October 23

Leonhard Hutter, German theologian and academic (b. 1563)

Leonhard Hutter (also Hütter, Latinized as Hutterus; 19 January 1563 – 23 October 1616) was a German Lutheran theologian.

12 Jan

Francisco Caldeira Castelo Branco
The city of Belém, Brazil is founded on the Amazon River delta, by Portuguese captain Francisco Caldeira Castelo Branco.
5 Mar

De revolutionibus orbium coelestium
Nicolaus Copernicus's book On the Revolutions of the Heavenly Spheres is added to the Index of Forbidden Books 73 years after it was first published.
25 Oct

Dirk Hartog
Dutch sea-captain Dirk Hartog makes second recorded landfall by a European on Australian soil, at the later-named Dirk Hartog Island off the West Australian coast.