The document provides a summary of the city of Vladimir, Russia. It was founded in 990 by Prince Vladimir the Red Sun and served as the capital of Rus from the 12th to 14th centuries. Currently with a population of 340,000, it remains an important industrial, educational, and cultural center. The passage also summarizes the history and significance of the Golden Gate of Vladimir, a rare 12th century fortification that was the main entrance to the city and has been preserved as a museum.