His father Anders Gustaf Myhrberg was a Swedish-born merchant and Captain in the Swedish Army who later became a customs official.

[2] In 1818, he became acquainted with visiting associate professor Adolf Ivar Arwidsson, frequenting opposition circles connected to him.

[5] Upon his father's death in 1823, he travelled to Spain where he briefly fought in the liberal uprising against the absolutist rule of Ferdinand VII; before being taken prisoner by the French army.

He arrived in Nauplion in 1825, initially serving in Colonel Auguste Regnaud de Saint-Jean d'Angély’s cavalry as a Trooper.

In January 1827, Myhrberg became Fabvier's aide-de-camp subsequently serving in the same role for Major General Thomas Gordon and Colonel Carl Wilhelm von Heideck.

Apprehensive to the growing influence of the Russian Party, Myhrberg left Greece in 1831 in order to participate in the Polish November Uprising.

The king was impressed by Myhrberg's military career, awarding him the title Knight of the Order of the Sword and the rank of major.

[5] He spent his final years in Stockholm where he died on 31 March 1867; upon his death he was given a state funeral, with full military honours at the Johannes Church graveyard despite never holding office in Sweden.