This paper emphasises the use of cultural knowledge and cultural expertise in court, with specific reference to civil proceedings. It adopts background scenarios characterised by the presence of ex officio judicial powers that introduce knowledge into trials regarding family and juvenile proceedings, guardianship of ill and elderly people, and immigration and asylum proceedings. The assumption of this paper is that when a situation involving intercultural elements is brought to the attention of the court, the usual background knowledge of the judge may be insufficient to render meaningful judgement. In this situation, thanks to ex officio powers (in introducing facts, gathering evidence, raising legal and factual questions), the judge should be ...