Birger, likely born around the time of the Battle of Gestilren in 1210, spent his childhood and adolescence in Bjälbo, Östergötland. The exact date of his birth is uncertain and historical sources are contradictory, but examinations of his remains suggest he was around 50 years old at his death in 1266, which would indicate a birth year around 1216.[9] However, since his father, Magnus Minnesköld, is believed to have died no later than 1210, Birger's birth may have occurred a few years earlier.[10]
Birger's mother Ingrid Ylva was, according to Olaus Petri, a daughter of Sune Sik and the granddaughter of King Sverker I of Sweden. His brothers or half-brothers—Eskil, Karl, and Bengt [sv]—were born well before 1200, suggesting they likely had a different mother. Birger was named after his uncle Birger Brosa, a jarl from the House of Bjälbo and one of the most powerful men of the era, who died in 1202.[10]
Birger married Ingeborg Eriksdotter, the sister of King Erik Eriksson in the mid-1230s, following intense competition with other suitors, as chronicled in the Chronicle of Erik (Erikskrönikan). This combination of family ties and strategic marriage would prove vital in his ascent to power.[10]
During the following 15 years, Birger consolidated his position and was probably one of the most influential men years before being formally given the title jarl in 1248 by King Eric XI. Birger was responsible for a military campaign against the Novgorod Republic in 1240, which Russian sources claim ended in a victory by Alexander Nevsky during what is known as the Battle of the Neva.[11] While Swedish sources give no information on the battle at all, a 16th-century Russian legend tells that the Swedish "king" was wounded in the face while dueling against Prince Alexander Nevsky himself.
Although Birger Jarl saw many battles, some have speculated that traces of a sword blow in Birger's cranium might have originated from this battle.[12] However, the original 14th-century Russian record of the battle gives no information on this at all.[13]
Career
When the papal diplomat William of Modena visited present Sweden around 1248, he urged the Swedish kings to fulfill the rules of the Catholic Church, an exhortation which Birger seems to have taken as a chance to strengthen his position by simply taking the side of the church against other members of his family (alternatively it's possible to interpret this as a manifestation of his pious side). This was a choice of historical importance as it was to make Birger a jarl powerful enough to ultimately wind up the office, thus making him the last Swedish jarl ever, even called as the "first true king of Sweden" by historians. As this happened during an era when the inherited concept Folkung became more of a political party, it also meant Swedish magnates lost most of their influence which paved the way for a consolidated Swedish kingdom supported by the Pope.[14]
In 1247, royal troops led by Birger at the Battle of Sparrsätra fought with Folkung forces led by pretender Holmger Knutsson, son of King Canute II. The Folkungs lost the battle and were unable to resist the central government and its taxes. Holmger Knutsson fled to Gästrikland and was captured there by Birger in the following year. Quickly brought to trial, he was beheaded.
In 1249, Birger succeeded in ending a decades-long period of hostilities with Norway. As a part of the Treaty of Lödöse, he also managed to marry off his daughter Rikissa, then only 11 years old, to Haakon Haakonsson the Young, the eldest son of King Haakon IV of Norway. Presumably later that year, Birger led an expedition to Finland, later dubbed as the Second Swedish Crusade, which permanently established the Swedish rule in Finland. On King Eric's death in 1250, Birger's son Valdemar was elected as the new king while Birger acted as regent, holding the true power in Sweden until his death.[15]
In 1252, a year after another victory over the folkungs at the Battle of Herrevadsbro [sv], Birger wrote two carefully dated letters, the first mention of Stockholm interpreted as the foundation of the city or at least some sort of special interest in the location. Neither of the letters give a description of the location, however, and while archaeological traces of older defensive structures have been found there, what did exist on the premises before the mid-13th century remains debated. It has been suggested Birger chose the location for several reasons: Partly to curb domestic magnates by isolating them with a "lock of Lake Mälaren", offering a defense to the lands around Mälaren from invading enemies in the process; and to create a commercial bridgehead to attract German merchants. While Birger's direct involvement in the foundation of the city remains speculative, it probably was no accident it was founded on the location at this time, as there were alternative passages into Mälaren during the preceding Viking Age; as Crusades, a kind of Viking raids in a Christian disguise, had proven increasingly unsuccessful; and as taking control over the location, traditionally where men supposedly gathered before the ledung, meant old offensive military traditions could be replaced by more "modern" commercial efforts directed towards Lübeck. Birger thus combined financial support from Germany with papal political support to consolidate his own position.[16]
Late life
Ingeborg died in 1254 and in 1261 Birger married the Danish queen dowager Matilda of Holstein. Birger died on 21 October 1266, at Jälbolung in Västergötland. His grave in Varnhem Abbey was opened in May 2002.
^Upon examination of his bones in 2002, it was determined that Birger would have been just around 50 at the time of his death, about 10 years younger than previously believed. See Kari, Risto. Suomalaisten keskiaika. WSOY 2004. ISBN951-0-28321-5. See page 119.
Harrison, Dick (2002). Jarlens sekel: en berättelse om 1200-talets Sverige [The Century of the Jarl: A History of 13th-century Sweden] (in Swedish). Ordfront. ISBN978-91-7441-359-5.