Mint Year: 1664 Reference: KM-55. Denomination: Solidus (Schilling, Silins) Condition: Minor greenish deposits, otherwise XF! Material: Billon (very low grade silver and bronze alloy) Diameter: 15mm Weight: 0.39gm 

Riga developed as the main merchandise centre of the Livonia Confederation and was a chain between merchants of Western Europe and Lands of Russia. In order to defend its trading interests, Riga joined the Hanseatic League during the late 13th century. Bishop Albert moved his residency here from Ikskile in 1201-02, thus establishing the Bishopric of Riga (the Archbishopric since 1255). Riga had its own coat of arms and flag since 1220's until 1581. When the Livonia Confederation was dissolved in 1561, Riga got the status of free city on the same year. This status lasted until 1581, when Riga had to accept the reign of Poland as the result of later phases of Livonia War.

Charles XI, also Carl (Swedish: Karl XI) (24 November 1655 – 5 April 1697 OS[2]) was King of Sweden from 1660 until his death in a period of Swedish history known as the Swedish Empire (1611–1718).

He was the only son of King Charles X Gustav of Sweden and Hedwig Eleonora of Holstein-Gottorp. His father died when he was four years old, so Charles was educated by his governors until his coronation at the age of seventeen. Soon afterward, he was forced out on military expeditions to secure the recently acquired dominions from Danish troops in the Scanian War. Having successfully fought off the Danes, he returned to Stockholm and engaged in correcting the country's neglected political, financial and economic situation. He managed to sustain peace during the remaining 20 years of his reign. Changes in finance, commerce, national maritime and land armaments, judicial procedure, church government and education emerged during this period. Charles XI was succeeded by his only son Charles XII, who made use of the well-trained army in battles throughout Europe.

The fact that Charles was crowned as Charles XI does not mean that he was the 11th king of Sweden who had the name Charles. His father's name (as the 10th) was due to his great-grandfather, King Charles IX of Sweden (1604–1611), having adopted his own numeral by using a mythological History of Sweden. This ancestor was actually the 5th King Charles. The numbering tradition thus begun still continues, with the present king of Sweden being Carl XVI Gustaf.