The Catholic Monarchs Isabella of Castile<span>, Queen of </span>Castile<span> and her husband </span>King Ferdinand<span>, King of </span>Aragon<span>, pursued a policy of joint rule of their kingdoms and created a single Spanish monarchy. </span>
These engines were very useful to move machinery in mills, factories, pumping stations and transportationapplications. In the field of transport,steam engines were often used inlocomotives, ships and other land vehicles. Steam machines were of great importance in their application in the field of agriculture.
