Jan Cock Blomhoff (Amsterdam; 5 August 1779 - Amersfoort; 15 August 1853) was director ('opperhoofd') of Dejima; the Dutch trading colony in the harbour of Nagasaki; Japan; 1817 - 1824. During his first stay on the island (1809-1813) he had an affair with a Japanese woman and the couple had a child; which died in 1813. When he arrived in Dejima for the second time in August 1817 he was accompanied by his wife Titia Bergsma; whom he had married in 1815; his son Johannes; and Petronella Munts; a Dutch wetnurse and an Indonesian maid. The ladies and the little boy were not allowed to stay. In the short time they stayed there; till December 1817; they were often drawn by artists who had only ever seen Japanese women. 500 hundred different prints were made and widely circulated throughout the country.