Iceland

In the ensuing centuries, Iceland became one of the poorest countries in Europe. Infertile soil, volcanic eruptions, deforestation and an unforgiving climate made for harsh life in a society where subsistence depended almost entirely on agriculture. The Black Death swept Iceland twice, first in 1402–04 and again in 1494–95. The former outbreak killed 50% to 60% of the population, and the latter 30% to 50%.
Around the middle of the 16th century, as part of the Protestant Reformation, King Christian III of Denmark began to impose Lutheranism on all his subjects. Jón Arason, the last Catholic bishop of Hólar, was beheaded in 1550 along with two of his sons. The country subsequently became officially Lutheran and Lutheranism has since remained the dominant religion.
In the 17th and 18th centuries, Denmark imposed harsh trade restrictions on Iceland. Natural disasters, including volcanic eruption and disease, contributed to a decreasing population. Pirates from several countries, including the Barbary Coast, raided its coastal settlements and abducted people into slavery. A great smallpox epidemic in the 18th century killed around a third of the population. In 1783 the Laki volcano erupted, with devastating effects. In the years following the eruption, known as the Mist Hardships (Icelandic: Móðuharðindin), over half of all livestock died in the country. Around a quarter of the population died in the ensuing famine.