The construction of this Gothic church began in 1387, soon after Lithuania's conversion to Christianity. Zygmunt August gave it to the Jesuits in 1571, but it was transferred to the University following the abolition of the Jesuit Order in 1773. The present church, late Baroque, dates from restoration work carried out after the fire of 1737. Ask to see the church's ten altars (this is the only church in the Baltics with so many). Converted into the Museum of Scientific Thought under the Soviet occupation, St. John's was reopened to public worship in October, 1991. It is named after two Saints, the Church of St. John the Baptist and St. John the Apostle and Evangelist.