The Cook Islands, a sovereign state in free association with New Zealand, uses two official legal tender currencies. The New Zealand Dollar circulates in parallel with the local Cook Islands Dollar; at the same time, the government also authorises many legal tender coins in the Cook Islands Dollar currency for collector's purposes.
Collector coins are dedicated to historical or general popular culture themes not related to the country itself. Many of them are in bullion sizes based on the troy ounce, but some are "metric", like twenty-five grams (25g) of silver.
This coin is part of the History of the Crusades series and is dedicated to The Fifth Crusade and John of Brienne.
The Mint says about it:
The Crusades were a series of religiously sanctioned military campaigns waged by much of Latin Christian Europe, particularly the Franks of France and the Holy Roman Empire during the 11th to 15th century. Each coin depicts a unique scene from that crusade and the most important commander/leader in that crusade.
The Fifth Crusade (1213 - 1221) was an attempt to reacquire Jerusalem and the rest of the Holy Land by first conquering the powerful Ayyubid state in Egypt. Pope Innocent III and his successor Pope Honorius III organised crusading armies led by King Andrew II of Hungary and Duke Leopold VI of Austria, and a foray against Jerusalem ultimately left the city in Muslim hands. Later in 1218, a German army led by Oliver of Cologne, and a mixed army of Dutch, Flemish and Frisian soldiers led by William I, Count of Holland joined the crusade. In order to attack Damietta in Egypt, they allied in Anatolia with the Seljuk Sultanate of Rom which attacked the Ayyubids in Syria in an attempt to free the Crusaders from fighting on two fronts. After occupying the port of Damietta, the Crusaders marched south towards Cairo in July of 1221, but were turned back after their dwindling supplies led to a forced retreat. A nighttime attack by Sultan Al-Kamil resulted in a great number of crusader losses, and eventually in the surrender of the army. Al-Kamil agreed to an eight-year peace agreement with Europe.