Santomera has been inhabited by human beings since the
Stone Age and former stone sculpt workplaces are the evidence of that fact. There was also human presence during the
Chalcolithic and the
Bronze Age along with people of the
Argaric culture. Another people that stayed in the current municipality are the
Iberians and constructed a town there. There is a remaining structure of the period of
Muslim occupancy in the Iberian Peninsula and it consists in a watermill. The first documentary reference in which the toponym Santomera appears dates back to the
Reconquista era. The king of The
Taifa of Murcia signed a treaty with Castile in which the territory would become part of Castilian rule in 1243. However, the territory was Muslim until a Mudejar revolt in 1264–1266. The king James I of Aragon defeated the revolt. The former Taifa of Murcia was quite empty and the Castilian king decided to repopulate it. People from Catalonia, Aragon and beyond the Pyrenees moved to the Kingdom of Murcia and some new inhabitants of the kingdom were bestowed 559,000 km2 of Santomera. In the 16th century there was an increase in the population and the expansion of the town owing to two facts. The first one is the fact that part of the territory was desiccated. That brought on the use of those lands and constructing on them. Some noble and religious landowners obtained the new available lands. Another important fact is that mining activities were performed again. The mining resources were exhausted in the 18th century. However, there were other economy resources such as the ones related to agriculture. The economy rise stopped after the
Peninsular War. Santomera obtained an own town council along with the Spanish Constitution of 1812. The independence from Murcia municipality ceased when the absolutist king Ferdinand VII reached the throne. During the
Trienio Liberal (1820-1823), Santomera was liberated from Murcia again, but became part of Murcia again after this period. There was another own municipality period from 1836 to 1848. In 1879, a flood occurred in the current municipality and it caused high damages to crop lands, herds, dwellings and even some people deceased. There were other two floods in 1906 and 1947. Those also caused demises of dozens of people and dwellings were destroyed. A reservoir was constructed from 1960 to 1965. A development took place in Santomera in 1970 decade in its economic branches, agriculture, industry and trade. Potable water also began to be available in that decade. Those conditions brought back the municipality independence wish among the locals. They gathered in a popular assembly in 1967. A document was handed in to Murcia town council in 1971, but the issue began to be addressed a year later. The town council rejected the independence of Santomera. Locals of Santomera lodged an application to a ministry of the national government. The organisation considered Murcia town council action as illegal and invalid. The process for Santomera own town council started, it progressed slowly and would last some years. In 1978 the administrative process ended and Santomera obtained the independence permission. The current municipality began its existence on 29 September 1978. == Geography ==