context: The park was laid out in 1839-1843. by order of the seafarer F. F. Bellingshausen, who was during this period the chief commander of the port of Kronstadt [1]. In 1861, a cast-iron grate was built to enclose the park, and in 1887 it was replaced by a new one that has survived to the present. In 1886, the park was extended beyond the Catherine Bridge. Until 1893, the boulevard was closed in winter, since that time they began to clear the alleys, and it became available to the public at any time [2]. The people often called the “boulevard” due to the fact that they liked to walk dogs in it, although this was forbidden by the authorities [1].
question: When was the Catherine Park defeated?
answers.text: 1839-1843