Nizhyn first appears in the record in 1147 under the name Unenezh, but its great century was the seventeenth, when it thrived as a self-governing town under Magdeburg rights and a seat of Cossack power. In 1663 it became the stage for one of the most turbulent moments in Ukrainian history: the Black Council, a raucous open assembly of Cossacks that elected Ivan Briukhovetsky as Hetman of the Zaporizhian Host. The gathering helped harden the split of the Cossack lands into Left-bank and Right-bank Ukraine, a division that would shape the region for generations. Nizhyn was also home to a major Cossack regiment until 1782, and the town wore its military and mercantile pride openly. Its greatest fair, held each year on Pokrova Day, was the largest of its kind in all of Left-bank Ukraine, drawing traders from across the region and beyond.

Trade drew outsiders, and one community shaped Nizhyn more than most. A thriving Greek merchant colony settled here, granted special privileges by the Cossack leaders Bohdan Khmelnytsky and Ivan Mazepa, and built its own church and magistrate. Their wealth helped fill the town with the Baroque architecture that still defines it: seven great churches, among them the Cossack Cathedral of St. Nicholas, raised in 1658 and crowned with the pear-shaped domes typical of the era. Then there is the pickle. Nizhyn has long been celebrated across the region for its cucumbers, so beloved that the town raised a monument to them. It is the kind of detail that says something true about a place, that here, alongside the cathedrals and the Cossack glory, a humble vegetable earned its own pedestal in the square.

For much of the nineteenth and early twentieth centuries, Nizhyn was a major center of Jewish life and of Hasidic Judaism. By 1897, Jews made up nearly a quarter of the town, more than 7,000 people, and Nizhyn holds the ohel, the tomb, of the Chabad-Lubavitch master Rabbi Dovber Schneuri. This was a community of merchants, actors, and scholars, and it produced figures who carried Nizhyn's name into the wider world. It was also a community that suffered grievously. Pogroms tore through in 1881 and 1905, and more followed during the upheavals of 1918. When German forces occupied the region in the Second World War, they murdered the Jews of Nizhyn; only those who had already fled survived. The community that had shaped the town for a century was, in a matter of months, all but erased. Its synagogues, its hotel, its people are remembered now in stone and in name.

For a modest city on a quiet river, Nizhyn has an astonishing roster of native and adopted sons and daughters. Sergey Korolyov, the secretive chief designer who became the father of the Soviet space program and put the first satellite and the first human into orbit, is claimed among its notable people. So is Yuri Lisyansky, who helped lead the first Russian circumnavigation of the globe and has a memorial museum in the town. Olga Khokhlova, the ballerina who married Pablo Picasso, is on the list, alongside actors, painters, and singers stretching from imperial Yiddish theater to a modern Ukrainian pop band. It is a lot of history for one place, layered church upon church, name upon name, all of it gathered along the banks of the Oster where a homesick schoolboy once dreamed of getting out.