Jantine Tammes was born in 1871 in the Peperstraat in Groningen. Her father made chocolate, cocoa and sugar products. She went to a secondary school for girls and in 1890 she entered the University of Groningen. She was allowed to go to lectures and practicals, but not to take exam.
That year there were just 11 female students in a total of 415 students and their number grew very slowly. In 1896 Tammes founded a "walking club" with two other female students and in 1898 this became the Groningen Female Student Society, which was named Magna Pete in 1912. This is the oldest 'sorority' in the Netherlands.