Andrew Tanca was an obscure Judge of Logudoro in the mid eleventh century. He may have reigned alongside his supposed father Barisone I

Barisone I of Torres

Barison I or Barisone I was the giudice of Arborea from around 1038 until about 1060 and then of Logudoro until his death sometime around 1073. He is the first ruler of Logudoro of whom we have any real knowledge. His whole policy was opposition to Pisa and support of monastic immigration from...

 between about 1064/1065 and 1073 or so. He was probably the father (alternatively, uncle or brother) of his probable successor, Marianus I

Marianus I of Torres

Marianus I was the Judge of Logudoro from 1073, when he is first mentioned after his father or grandfather, Barisone I, until about 1082, when he is last mentioned...

. Little else is known for certain about him, but he was probably a donor to the Abbey of Montecassino.

Sources

• Manno, Giuseppe. Storia di Sardegna. 2005.