Watermill in the context of "Beam engine"

Ancient Greek technology developed during the 5th century BC, continuing up to and including the Roman period, and beyond. Inventions that are credited to the ancient Greeks include the gear, screw, rotary mills, bronze casting techniques, water clock, water organ, the torsion catapult, the use of steam to operate some experimental machines and toys, and a chart to find prime numbers. Many of these inventions occurred late in the Greek period, often inspired by the need to improve weapons and tactics in war. However, peaceful uses are shown by their early development of the watermill, a device which pointed to further exploitation on a large scale under the Romans. They developed surveying and mathematics to an advanced state, and many of their technical advances were published by philosophers, like Archimedes and Heron.

A fief (/fiːf/; Latin: feudum) was a central element in medieval contracts based on feudal law. It consisted of a form of property holding or other rights granted by an overlord to a vassal, who held it in fealty or "in fee" in return for a form of feudal allegiance, services or payments. The fees were often lands, land revenue or revenue-producing real property like a watermill, held in feudal land tenure: these are typically known as fiefs or fiefdoms. However, not only land but anything of value could be held in fee, including governmental office, rights of exploitation such as hunting, fishing or felling trees, monopolies in trade, money rents and tax farms. There never existed a standard feudal system, nor did there exist only one type of fief. Over the ages, depending on the region, there was a broad variety of customs using the same basic legal principles in many variations.

Fulling, also known as tucking or walking (Scots: waukin, hence often spelt waulking in Scottish English), is a step in woollen clothmaking which involves the cleansing of woven cloth (particularly wool) to eliminate (lanolin) oils, dirt, and other impurities, and to make it shrink by friction and pressure. The work delivers a smooth, tightly finished fabric that is insulating and water-repellent. Well-known examples are duffel cloth, first produced in Flanders in the 14th century, and loden, produced in Austria from the 16th century on.

Waulking could be done with the hands and feet. In medieval Europe, it was done in water-powered fulling mills. After the Industrial Revolution, coal and electric power were used.

This list of ancient watermills presents an overview of water-powered grain-mills and industrial mills in classical antiquity, including the Hellenistic period through the Roman period up until circa 500 AD.

The water wheel and watermill are the earliest instances of machines harnessing natural forces to replace human muscular labour (apart from the sail). As such, it holds a special place in the history of technology and also in economic studies where it is associated with growth.

A water wheel is a machine for converting the kinetic energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a large wheel (usually constructed from wood or metal), with numerous blades or buckets attached to the outer rim forming the drive mechanism. Water wheels were still in commercial use well into the 20th century, although they are no longer in common use today. Water wheels are used for milling flour in gristmills, grinding wood into pulp for papermaking, hammering wrought iron, machining, ore crushing and pounding fibre for use in the manufacture of cloth.

Some water wheels are fed by water from a mill pond, which is formed when a flowing stream is dammed. A channel for the water flowing to or from a water wheel is called a mill race. The race bringing water from the mill pond to the water wheel is a headrace; the one carrying water after it has left the wheel is commonly referred to as a tailrace.