Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Ciutadilla:

"

Ciutadilla village developed around its castle, and spread downhill. The castle is mentioned in extant 12th-century documents, and was significantly improved in the 16th century. It was badly damaged during the First Carlist War in 1835, and fell into ruins after that.[1] The municipality's population reached a peak of 872 in 1887, but has since steadily declined with the rest of the region to 209 in 2013.[2] Many archaeological remains from the Iberic, Greek and Roman periods have been found in the municipality.[1]