Porre
Porre is a small village on the Zenan Continent in 600 AD and Present, but eventually evolves into a major world power and destroys the nation of Guardia.
Porre as a Village
Porre exists in both 600 AD and 1000 AD as a small village, with very few differences across the 400 year gap. Due to Crono's actions in the past, the mayor of Porre in 1000 AD is an incredibly altruistic man.
Porre as a World Power
In an FMV added to the PSX and DS versions of Chrono Trigger, the nation of Guardia is shown to be destroyed in 1005 AD. During the story of Chrono Cross, it is revealed that Porre was responsible for invading it and causing this destruction. General Viper served in the Porre army starting in the year 1003, but retired after less than two years. Exactly how Porre transformed from its humble state in Chrono Trigger to the militaristic world power that it is portrayed as in Chrono Cross in such a short time is unclear, but it is known that Lynx was responsible for leading Porre's invasion of the El Nido archipeligo.