Lecturer at the Jesuit College at St. James’s, Ljubljana (1769–1773)
Gabriel Gruber was born on May 6, 1740, in Vienna. His parents later moved to Ljubljana, settling in a house in Rožna dolina, where the U.S. Embassy is located today.
In 1755, Gruber entered the Jesuit order. He completed philosophical and theological studies in Vienna and taught Latin and astronomy at the Oriental Academy, where he educated ship navigators for both inland waterways and the open sea.
In 1769, he arrived at the Jesuit College in Ljubljana, where he taught drawing, geometry, mechanics, and hydraulics at the Chair of Mechanics. Among his students were Jurij Vega and Žiga Zois.
At that time, Empress Maria Theresa was implementing numerous reforms, including agricultural projects. One goal was to convert the Ljubljana Marshes (Ljubljansko barje) into usable farmland. This required a comprehensive drainage system, and ideas for transforming this part of Carniola were debated in Ljubljana.
To carry out this task, the authorities sought a state-appointed hydraulic engineer, and Gruber was chosen for the job due to his experience managing navigation on Austria’s rivers (except the Danube). In 1772, he began the construction of canals and the drainage of the Ljubljana Marshes.
At the same time, he was also building two houses—one below Rožnik Hill and another at Levestikov trg in the center of Ljubljana. The costs escalated, and the work progressed slower than expected. Due to financial constraints and political opposition, Gruber could not complete the canal. The work was taken over by Vincenc Struppi, who finished it in 1782. The canal is still known today as Gruber’s Canal (Gruberjev prekop).
In 1784, Gruber moved to Russia, first to Polotsk and later to Saint Petersburg, where many Jesuits found refuge after the suppression of the order in 1773. He was soon recognized as a highly skilled scientist and educator, teaching architecture, mechanics, and physics at the Jesuit College in Polotsk. He later became rector of the college and provincial of the Russian Jesuit province.
Several important buildings in Saint Petersburg were constructed according to his designs. He was also an inspiring mentor to young engineers, respected even at the imperial court of Peter the Great, and later recognized as a teacher and adviser to figures from aristocratic circles, including Leo Tolstoy.
Gabriel Gruber died on April 7, 1805, in a fire at the Jesuit College in Saint Petersburg, where he is also buried.
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