Lambert was the second son of Adalbert II of Tuscany

Adalbert II of Tuscany

Adalbert II , called the Rich, son and successor of Adalbert I of Tuscany, and grandson of Boniface II, was much concerned in the troubles of Lombardy, at a time when so many princes were contending for the wrecks of the Carolingian Empire. Before his father died in 884 or 886, he is accredited the...

 and Bertha

Bertha, daughter of Lothair II

Bertha was the second illegitimate daughter of Lothair II, King of Lotharingia, by his concubine Waldrada. She was renowned to be beautiful, spirited, and courageous. Ambition, coupled with her influence, involved her husbands in many wars....

, daughter of Lothair II of Lotharingia

Lothair II of Lotharingia

Lothair II was the second son of Emperor Lothair I and Ermengarde of Tours. He was married to Teutberga, daughter of Boso the Elder. He is the namesake of the Lothair Crystal, which he probably commissioned, and of the Cross of Lothair, which was made over a century after his death but...

. He succeeded his elder brother, Guy

Guy of Tuscany

Guy was the count and duke of Lucca and margrave of Tuscany from 915, the death of his father Adalbert II, to his own death. He was originally under the regency of his mother Bertha, daughter of Lothair II of Lotharingia, until 916.He kept court at Mantua around the year 920...

, as count and duke of Lucca

Lucca

Lucca is a city and comune in Tuscany, central Italy, situated on the river Serchio in a fertile plainnear the Tyrrhenian Sea. It is the capital city of the Province of Lucca...

 and margrave of Tuscany on his death in 928 or 929 without heirs.

In 931, before 17 October, Hugh, King of Italy

King of Italy

King of Italy is a title adopted by many rulers of the Italian peninsula after the fall of the Roman Empire...

, disowned and removed Lambert, giving Tuscany and the familial possession of Lucca to his brother Boso

Boso of Tuscany

Boso was the count of Arles and Avignon , and margrave of Tuscany . He was the younger son of Theobald of Arles and Bertha, illegitimate daughter of Lothair II of Lotharingia. His elder brother was Hugh, king of Italy.Boso supported his brother's Italian designs...

. Hugh was Guy and Lambert's half-brother, as they had the same mother. When Guy died, Hugh married Guy's widow, Marozia

Marozia

Marozia, born Maria and also known as Mariuccia or Mariozza , was a Roman noblewoman who was the alleged mistress of Pope Sergius III and was given the unprecedented titles senatrix and patricia of Rome by Pope John X.Edward Gibbon wrote of her that the "influence of two sister prostitutes,...

.

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