the west – the settlements of St. Martin (Święty Marcin) and St. Adalbert (Święty Wojciech). Chwaliszewo was among the areas added in the eastward expansion of 1800. During the first half of the 19th century the old city walls were taken down and the new western areas of the city (forming most of the modern city centre) were developed. The fortifications on the Cytadela ("Fort Winiary") were built between 1828 and 1842. This was part of the overall Festung Posen system of fortifications built around the city from the 1830s onwards. The left-bank fortifications all lay within today's Stare Miasto district, following roughly the line of Al. Niepodległości and ul. Krakowska. In the later 19th century an outer ring of forts was built, of which Forts IVa, V and Va now lie within Stare Miasto district. The next northward expansion of the city's boundaries occurred in 1925, when the Cytadela and the area of Winogrady were incorporated into the city. Naramowice was added under Nazi occupation in the 1940s, and Piątkowo in 1974, leading to the extensive residential development of that neighbourhood (which was already underway in Winogrady). The most northerly parts of Poznań (Morasko, Radojewo, Umultowo, Nowa Wieś Górna, Nowa Wieś Dolna) were brought within the city boundaries in 1987. Districts of Poznań