First record of the St. Peter's Church dates back to 1209. The church was a masonry construction and therefore undamaged by a city fire in Riga that year. The history of the church can be divided into three distinct periods: two associated with Gothic and Romanesque building styles, the third with the early Baroque period. The middle section of the church was built during the 13th century, which encompasses the first period. The only remnants of this period are located in the outer nave walls and on the inside of a few pillars in the nave, around which larger pillars were later built.
The second period dates to 15th century, when master builders Johannes Rumeschottel from Rostock supervised the construction of the sanctuary, based on the St. Mary's Church in Rostock. The old bell tower was replaced in 1456, and a bell was hung in the new tower in 1477. A 136 metres (446 ft) octagonal steeple was added to the tower in 1491, which, along with the church's front facade, dominated the silhouette of Riga. The tower collapsed 11 March 1666, destroying a neighboring building and burying eight people in the rubble.
Three identical portals by Bindenshu and Andreas Peterman were added in 1692. The third period of construction dates to 1671–90. The newly renovated church served for a mere 29 years, for lightning struck and set fire to the tower and church 10 May 1721. Only the church and tower walls remained standing after the fire. Reconstruction of the church began immediately under the direction of the master carpenter Tom Bochum and master mason Kristofer Meinert. By 1723 the building already had a temporary roof. Johann Heinrich Wilbern took over supervision of the project in 1740, and under his direction a new 69.6 metres steeple was built in 1746.
The church burned down 29 June 1941. Conservation and restoration began 1954 with research by architect Pēteris Saulītis. The work was carried out from 1967 to 1983 under the direction of Saulītis and architect Gunārs Zirnis. The St. Peter's Latvian Lutheran congregation resumed services in the church 1991, and the church was returned to the ownership of the Evangelical Lutheran Church of Latvia on 4 April 2006.References:
Ängsö Castle was first named as "Engsev" in a royal charter by king Canute I of Sweden (r. 1167-1196), in which he stated that he had inherited the property after his father Eric IX of Sweden. Until 1272, it was owned by the Riseberga Abbey, and then taken over by Gregers Birgersson.
From 1475 until 1710, it was owned by the Sparre family. The current castle was built as a fortress by riksråd Bengt Fadersson Sparre in the 1480s. In 1522, Ängsö Castle was taken after a siege by king Gustav Vasa, since its owner, Fadersson's son Knut Bengtsson, sided with Christian II of Denmark. However, in 1538 it was given by the king to Bengtsson's daughter Hillevi Knutsdotter, who was married to Arvid Trolle.
In 1710, the castle was taken over by Carl Piper and Christina Piper. Ängsö Castle was owned by the Piper family from 1710 until 1971, and is now owned by the Westmanna foundation. The castle building itself was made into a museum in 1959 and was made a listed building in 1965. It is currently opened to visitors during the summers.
The castle is a cubical building in four stores made by stone and bricks. The lower parts is preserved from the middle ages. It was redecorated and expanded in the 1630s. The 4th storey as well as the roof is from the expansion of Carl Hårleman from 1740-41. It gained its current appearance in the 1740s.