According to a book about the Neanderthals (by Friedemann Schrenk and Stephanie Mueller) first published in 2005 (English translation, 2009), a date of 1.8 million years has been proposed for stone tools at a site in Spain. About a million years ago early humans had reached central Europe. This would be Homo erectus. A European variant of H. erectus called Homo heidelbergensis led to the Neanderthals. There is evidence for Homo heidelbergensis between 800,000 and 350,000 years ago in Spain, Italy, France, England, Germany, and Greece.