G. T. van Ysselsteyn

Gerardina Tjaberta van Ysselsteyn (1892 – 1975) was a Dutch art historian and textile specialist who wrote several books on the Dutch textile industry.

Van Ysselsteyn was born in Rotterdam as the daughter of the civil engineer Hendrik Albert van IJsselsteyn, Minister of Agriculture and Economics of the Netherlands from 1918 to 1922, after whom the village of Ysselsteyn has been named.

In 1931, van Ysselsteyn conjectured that the Huguenot tract Vindiciae contra tyrannos published in 1579, whose authorship is still unclear, was a collaboration between Hubert Languet and Philippe de Mornay.