and is today a ruin situated in Minneparken. 15 May is celebrated as St. Hallvard's Day. This is also known as Oslo Day. References External links St. Hallvard Den hellige Hallvard St. Hallvard's Day Hl. Hallvard fra Lier 1020s births 1043 deaths Norwegian Roman Catholic saints 11th-century Christian saints 11th-century Christian martyrs People from Lier, Norway