In 1448, soon after his return to Mainz, Gutenberg borrowed 150 gulden from Johannes Fust - at that time a sum equivalent to five years' income of an average peasant.
This appointment, which involved teaching arithmetic and geometry, gave Rheticus a salary of 100 gulden .
One of the reasons is that there were three different currencies in use in Germany during the war - the thaler, the mark and the gulden .
Spain's contribution to her Habsburg's cousin was a mere 1.9 million gulden while the pope, who saw the Emperor as the defender of Catholicism, provided just 900,000 gulden .
Although these conditions seem strict by today's standards, they were typical of the time and earned the composer some 600 gulden a year with other benefits.
The island's unit of currency is the Aruban guilder or gulden .
The Austrian national debt in gulden rose from 372m. in 1790 to 658m. in 1800 and 1,011m. in 1821.