The southern side of the Mugnone Valley, in Tuscany. The narrow passage that you see between the two hills in the background marks the road to the central plains of Italy, toward Rome. It is here that, in 406 A.D., the Roman Army stopped the invading Goths in a memorable battle that lasted a few days. On Aug 23 of that year, Radagaisus, King of the Goths, was captured and executed on the hill that today takes the name of MonteReggi ("Mons Regis", the King's Mountain)
If you visit the Mugnone Valley, near the city of Fiesole, in Italy, you'll see a quiet place, mainly inhabited by people who commute everyday to Florence, just a few km away. But you may also note how the hills at the southern side of the valley mark the last natural obstacle for those who follow the road that goes through the Appennino mountains and leads to the central plains of Italy. Those hills have played the role of a line of defense more than once in history. Today, August 23rd, is the anniversary of the final act of the "battle of Faesulae" that raged there for a few days in the year 406 A.D. and that saw the attempt of the Goths to reach Rome stopped by a Roman Army.
In those years, Rome was entering what was to be the last century of the Western Roman Empire. The Roman society was experiencing a new phase of decline and collapse that led, among other things, to the loss of the fortifications that had protected the Empire's territory for centuries. Then, the peoples of the Eastern Regions, whom the Romans called "Barbarians," found that the road to to the Empire's territories was open for them. Entire populations moved onward and, in 406 A.D. the Goths, led by their King, Radagaisus, were marching South with the objective of conquering Rome.
The task of stopping the Goths fell on Flavius Stilicho, magister militum of the armies of the West and himself of Barbarian origin. He was acting on behalf of Emperor Honorius who, in the meantime, did nothing but hiding in Ravenna, protected by the marshes surrounding the city. In Gibbon's words (chapter 30 of "Decline and Fall of the Roman Empire")
..... such was the feeble and exhausted state of the empire, that it was impossible to restore the fortifications of the Danube, or to prevent, by a vigorous effort, the invasion of the Germans. The hopes of the vigilant minister of Honorius were confined to the defence of Italy. He once more abandoned the provinces, recalled the troops, pressed the new levies, which were rigorously exacted, and pusillanimously eluded; employed the most efficacious means to arrest, or allure, the deserters; and offered the gift of freedom, and of two pieces of gold, to all the slaves who would enlist
We don't have many details on how exactly the battle went, but it seems that the Goths first besieged Florence, then were forced to retreat and finally were trapped in the Mugnone valley; blocked by the fortifications built around the city of Faesulae. Gibbon tells us (chapter 30) that:
Conscious that he (Stilicho) commanded the last army of the republic, his prudence would not expose it, in the open field, to the headstrong fury of the Germans. The method of surrounding the enemy with strong lines of circumvallation, which he had twice employed against the Gothic king, was repeated on a larger scale, and with more considerable effect.
Surrounded, the Goths had no escape. The Romans and their Hunnic allies had turned the valley into a killing zone. After a few days of battle, they surrendered in great numbers, so many that the slave market is said to have collapsed for a brief period. King Radagaisus himself was captured and beheaded, putting an end forever to his attempt of conquering Rome.
It is just a legend and surely no king with that name ever ruled Florence. But the links with the historical fate of King Radagaisus are evident and the legend might well be a garbled rendition of the ancient battle of Faesulae. After all, many of the defeated Goths must have remained in the area around the valley, either as slaves or fugitives. A little of their blood may well still be with us, today.
Image of Montereggi taken on Aug 22nd 2012, showing also your modest author, Ugo Bardi. More pictures of the city of Fiesole can be found at my blog "Foto di Fiesole"
For more information about the tumultuous 5th century and the characters of the time, you can give a look at my article on Empress Galla Placidia "Chemistry of an Empire"