Gemaskerde optocht door de studenten, ter herdenking van jonker Willem, graaf van Oostervant, ter ere van de 290e stichtingsdag van de Universiteit van Leiden 1865

This silver medal, created by David van der Kellen in 1865, commemorates the 290th anniversary of Leiden University. The obverse features a depiction of Willem, Count of Oostervant, on horseback. The inscription reads "IN MEMORIAM DEI NATALI ACAD. LVGD. BAT. ANNO MDCCLXXVII," which translates to "In memory of the birth of the Leiden University on the 290th anniversary." The medal is a testament to the rich history and cultural significance of Leiden University.