The thrust to improve traditional Chianti, which by then-existing Italian DOC laws included two white grapes (!), started 40-50 years ago with Tignanello and Sassacaia. By the 1980's, super Tuscan blends had changed the world's opinion of Italian red wine. The rules for Chianti have also changed (no more white grapes), resulting in greatly improved wines that must be at least 80% Sangiovese.
There is still no precise definition for super Tuscans, though some of us think these blends should always have a majority of Sangiovese. We have seen "super Tuscans" on restaurant lists that have no Sangiovese at all. That's just wrong.
We do not wish to overwhelm the prized character of Sangiovese, a less powerful wine than Cabernet. Judicious amounts of the latter add a bit more weight and color to Villa Ragazzi's super Tuscan Faraona, and the Sangiovese shines through.