Before him, his father and grandfather, Count Boniface I of Lucca and Boniface II, probably of Bavarian origin, had controlled most of the counties of the region and had held higher titles as well, such as a Prefect of Corsica or a Duke of Lucca.
Tuscany | Saint Boniface | Margrave | Frederick I, Margrave of Brandenburg-Ansbach | Matilda of Tuscany | Henry, Margrave of Frisia | Waldemar, Margrave of Brandenburg-Stendal | Grand Duchy of Tuscany | Ferdinando I de' Medici, Grand Duke of Tuscany | Pope Boniface VIII | margrave | Cosimo I de' Medici, Grand Duke of Tuscany | Pope Boniface IX | Grand Duke of Tuscany | Cosimo III de' Medici, Grand Duke of Tuscany | Werner, Margrave of the Nordmark | Tuscany (rose) | ''Tuscany'' | Otto III, Margrave of Brandenburg | Lari, Tuscany | John, Margrave of Brandenburg-Kulmbach | Gunzelin, Margrave of Meissen | George Frederick Charles, Margrave of Brandenburg-Bayreuth | Boniface I, Margrave of Tuscany | Boniface II | Bernard, Margrave of the Nordmark | Willa of Tuscany | Vinci, Tuscany | tuscany | Saint-Boniface, Quebec |
However, Boniface's main sights were set not on the Piedmont but on nearby Alessandria: from 1227, when he strengthened an alliance with Asti, he continued until his death to fight the Alessandrini.
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On 4 May 1253, Conrad invested him with Casale and on 12 May he was dead at Moncalvo, only a few hours after dictating his testament.
He brought Western monasticism to the island by requesting monks from Abbot Desiderius of Montecassino and in this he was supported by both Pope Alexander II and Godfrey the Bearded, Margrave of Tuscany, though the archdiocese of Pisa, thitherto chief religious influence on the island, opposed it.
His first official act was to burn, in the presence of the assembled clergy, the anathema which Boniface II had pronounced against the latter's deceased rival Dioscurus on a false charge of simony and had ordered to be preserved in the Roman archives.
Until the 1803 secularisation of Bavaria, Steingaden belonged to the Steingaden Abbey, established in 1147 by Welf VI, Margrave of Tuscany and Duke of Spoleto, and third son of Henry IX, Duke of Bavaria.