from the reign of Guy III After the deposition of emperor Charles in late 887, by virtue of being a relative of Archbishop
Fulk of
Rheims, Guy tried to gain the
West Frankish Realm, but already in February 888 his main rival, count
Odo, was crowned king of the West Franks in
Compiègne. Thus in March 889, Guy tried to establish rule over
Lotharingia, and was crowned king in
Langres, hoping to gain support in southern Lotharingian and northern Burgundian regions. Having won the support of some Burgundian nobles such as
Anscar of Oscheret, he soon left for
Italy in order to claim the Italian royal crown. Guy of Spoleto was opposed by Berengar of Friuli for the
Iron Crown of Lombardy. Although Berengar had the advantage of being allied with the
Carolingian family, and of having been crowned as king of Italy in 887, from 888 Guy was closer to Rome, and had already allied himself with
Pope Stephen V, who had described Guy “as his only son”. Fighting between the rival contenders began, and it was Guy who had himself proclaimed king of Italy in a diet held at
Pavia at the end of the year 888. He was formally crowned
King of Italy by Pope Stephen V in 889 in Pavia, in the
Basilica of San Michele Maggiore, and this was followed by his coronation as
Roman Emperor on 21 February 891, together with the crowning of his son
Lambert II as King of Italy. The situation in
Italy began to deteriorate with the election of a new pope,
Formosus, in 891. Distrustful of Guy, he began to look elsewhere for support against the emperor, as Guy found it increasingly difficult to end the threat of Berengar who still held out in his Duchy of Friuli. To bolster his overall position, at
Ravenna on 30 April 892, Guy forced Pope Formosus to crown Lambert as co-emperor. The pope therefore took the next opportunity to oppose Guy by supporting
Arnulf of Carinthia for the Italian and imperial titles. In 893, Formosus invited Arnulf to come to
Trento to overthrow Guy and be crowned himself. Arnulf instead sent his son
Zwentibold with an army to join Berengar, the deposed king, and march on Trento. Their joint army surrounded Trento, but Guy probably bribed them to leave him unmolested. The following year, they defeated Guy at
Bergamo and took Trento and
Milan. Berengar was recognised as king and a vassal of Arnulf. Zwentibold returned to Germany, as fever had wreaked havoc on the German armies. Guy retreated in order to regroup at a fortified place on the
Taro and died there suddenly in late autumn, leaving his son under the tutelage of his wife. Both would contest the throne with Berengar and Arnulf. ==Legacy==