Erik Larsson was born on 13 July 1550 to of the noble family
Sparre and Britta Turesdotter of the noble family
Trolle. Lars was well-regarded, holding a strong reputation and friendship with King
Gustav I, serving as his top general. Records of Erik's youth are scarce and often contradictory, but it is likely that he studied abroad between 1569 and 1573; a 1570 record at the
University of Frankfurt an der Oder lists a student as ('Erik Sparre, noble, Swede'). He likely furthered his education in
Padua, Italy. During his time abroad, Sparre developed exceptionally strong language skills, particularly in
Italian and
Latin, though he was conversant in
French as well. At some point in 1574, he returned to Sweden. On 30 November of the same year, he proposed to Ebbe Brahe, daughter of
Per Brahe the Elder; Per was first cousin to
John III of Sweden and a highly-influential figure in the Swedish court. In 1575 or 1576, Sparre was appointed
Privy Councilor () and had a special interest in the organization of the
National Archives. Largely uninvolved in the everyday operations of the office, he was used by the court as a functionary and diplomat. He was effectively utilized as commissioner of negotiations with the
Danes in March 1575 regarding the
Swedish–Danish border before later being dispatched to the courts of the
Count of East Frisia and the
Holy Roman Emperor in the summer of the same year. Despite these early successes, Sparre was party to several power struggles between the Crown of Sweden, the Duke, and the high nobility, particularly with regards to the distribution of power. In March 1576, Sparre and other members of the nobility submitted new proposals for the
liturgy on behalf of the king and the appointment of higher officials to
Duke Charles, which he rejected. On 11 February 1577, Sparre, Brahe the Elder, and two other nobles from
Uppland met in
Stockholm with the clergy and the king, which affirmed the previous liturgical changes and drew Sparre in the middle of the power struggle between the king and the duke. Sparre married Ebbe Brahe in 1578 at a house owned by
Catherine Stenbock, the
dowager queen, on
Svartmangatan in Stockholm. John and his first wife,
Catherine Jagellonica, were present as guests for three days, while Catherine Stenbock – along with the
Margravine of Baden and the
Duchess of Mecklenburg – stayed for four or five days; both the margravine and the duchess were cousins of the king. In August 1580, Sparre served as commissioner for another meeting with the Danes in
Knäred and, the following year, he and
Hogenskild Bielke traveled to the
Duchy of Mecklenburg to negotiate a marriage between the king's sister,
Elizabeth, and
Duke Christopher of Mecklenburg. In 1582, Sparre was made of
Västmanland,
Bergslagen, and
Dalarna. On 1 March of the following year, one of John's officials, a
Scotsman named
Andrew Keith, honored Sparre with the title of
baron. Despite the honor, Sparre claimed never to have requested the title nor petitioned the king to have it recognized as legitimate. Sparre is considered one of the most learned men of his time, particularly in Sweden. He kept correspondence with many well-known scientists and historians of the era, such as the Danish astronomer
Tycho Brahe, and served as one of the
Rostock historian
David Chytraeus's patrons in Sweden. Sparre's patronage included part of the printing costs of the latter's work, namely his history of the
Nordic countries, ('The Chronicle of Saxony and [Those] Near the Arctic World'), published in 1590. ====