Evidence of art and handcraft production in the state dates back to about 300 BCE, with the earliest showing Olmec influence. In the 7th century, the Mezcala people established themselves in the region, introducing stone sculpture and ceramics, of Teotihuacan heritage. The Aztecs conquered much of the region, with some handcraft production becoming important tribute items, for example, gold worked into pieces for nobility and priests. After the Spanish conquest of the Aztec Empire, European techniques, designs and materials were introduced, which drastically changed how a number of products were made, and some indigenous products disappeared completely.