Which European country was the first to abolish slavery?

9th - 6th century BC in India: Jain teaching abolishes it.

1102 Trade in slaves and serfdom ruled illegal in London.

However, it was France as a country that first outlawed slavery when in

1315 Louis X, king of France, published a decree proclaiming that "France" signified freedom and that any slave setting foot on the French ground should be freed.