Laidulf was a son, probably the youngest or second youngest, of Pandulf Ironhead

Pandulf Ironhead

Pandulf I Ironhead was the Prince of Benevento and Capua from 943 until his death. He was made Duke of Spoleto and Camerino in 967 and succeeded as Prince of Salerno in 977 or 978...

. He probably never expected to inherit much, especially with so many cousins vying for their rightful inheritances. He was the count of Teano

Teano

Teano is a town and comune of Campania, Italy, in the province of Caserta, 30 km north-west of that town on the main line to Rome from Naples. It stands at the south-east foot of an extinct volcano, Rocca Monfina.- Ancient times and Middle Ages:...

. He is implicated, however, in the assassination of his brother, Landenulf

Landenulf II of Capua

Landenulf II succeeded his brother Landulf VI as Prince of Capua in 982 and ruled until his assassination. He was one of the younger sons of Pandulf Ironhead....

, and the archbishop of Benevento in 993.

He succeeded his brother as Prince of Capua. In 994, he gave Sant'Angelo in Asprano to Manso, abbot of Montecassino. He swore to forever defend the abbot's jurisdiction. In 999, the Emperor Otto III came down and avenged the murder of his ally Landenulf. He removed Laidulf from power brought him back a prisoner to Germany. He placed Adhemar

Adhemar of Capua

Adhemar was the Duke of Spoleto from 998 and Prince of Capua from 1000. Before his death, he lost both domains. He is not mentioned as duke of Spoleto after December 999.He was the son of Balsamo, a Capuan cleric...

 on the Capuan throne.

Laidulf may be the father of Gemma, wife of Guaimar IV of Salerno

Guaimar IV of Salerno

Guaimar IV was Prince of Salerno , Duke of Amalfi , Duke of Gaeta , and Prince of Capua in Southern Italy over the period from 1027 to 1052. He was an important figure in the final phase of Byzantine authority in the Mezzogiorno and the commencement of Norman power...

.