The university in Gießen was founded in 1607 as the Ludoviciana, after the then-ruling Landgrave of Hessen-Darmstadt, Ludwig V.
His reason for founding a new university was that the nearby University of Marburg, in the neighboring landgraviate of Hessen-Marburg, had converted to Calvinism, so Ludwig as a fervent Lutheran was no longer willing to let his subjects study there.
The former Ludoviciana is now named after its most famous scientist, the chemist Justus Liebig (1803-1873). Liebig was appointed as a professor in Gießen in 1824 at the age of 21 on the recommendation of Alexander von Humboldt, who had been one of his teachers in Paris.
A university website describes Liebig as “the father of modern experimental chemistry“ and says that he “gave the world baking powder, fertilizers, chloroform, and meat extract (among other important things).”
This centrally located garden belongs to the Justus Liebig University and is said to be the oldest botanical garden in Germany that is still at its original location. It was founded in 1609 as a Hortus Medicus or garden of medicinal plants. Admission is free. There are entrances on the Sonnenstraße and Senckenbergstraße.
This is the main building (in German Hauptgebäude) of the university at Ludwigstraße 23 in Gießen. It is often referred to as the Aula because the largest lecture and assembly hall is here.
The words at the top of the façade are Academia Ludoviciana, the university’s original Latin name. The two dates in Roman numerals are MDCVII, meaning 1607, the year the university was founded, and MDCCCLXXIX, meaning 1879, the year the main building was inaugurated.
By far the largest campus of the Justus Liebig University is this one at the south end of the city of Giessen. Here there are dozens of buildings, large and small, housing the various medical institutes and clinics.
As of 2020/21, the Justus Liebig University has eleven faculties with 28,400 students, making it the second largest university in Hessen (after the Goethe University in Frankfurt).
My photos in this post are from 2004. I revised the text in 2021.