Her Wikipedia article is here. The introduction follows: Anne of Denmark (12 December 1574 – 2 March 1619) was queen consort of Scotland, England, and Ireland as the wife of King James VI and I.
The second daughter of King Frederick II, Anne married James in 1589 at the age of fourteen and bore him three children who survived infancy, including the future Charles I. She demonstrated an independent streak and a willingness to use factional Scottish politics in her conflicts with James over the custody of Prince Henry and his treatment of her friend Beatrix Ruthven. Anne appears to have loved James at first, but the couple gradually drifted and eventually lived apart, though mutual respect and a degree of affection survived.
In England, Anne shifted her energies from factional politics to patronage of the arts and constructed a magnificent court of her own, hosting one of the richest cultural salons in Europe. After 1612, she suffered sustained bouts of ill health and gradually withdrew from the centre of court life. Though she was reported to have died a Protestant, evidence suggests that she may have converted to Catholicism at some stage in her life.
Historians have traditionally dismissed Anne as a lightweight queen, frivolous and self-indulgent. However, recent reappraisals acknowledge Anne's assertive independence and, in particular, her dynamic significance as a patron of the arts during the Jacobean age."