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In 1736, Leonhard Euler studied the well known Seven Bridges of Königsberg problem. The city of Königsberg, now Kaliningrad, is spread over a couple of islands, and the communities of those islands were, back then, connected with each other with 7 bridges, as depicted in the figure below, from the original publication by Leonhard Euler in 1736:
Euler wondered whether it was possible to take a walk through the city, crossing each of the bridges exactly once and returning back to the starting island. this is not possible, and Euler used a formal framework to test this for more general cases. The publication and its implications are currently considered as the start of graph theory.
The river that separates the central communities of Kaliningrad is the river Pregel, or Pregolya, our namesake (and our logo's sake).
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