Good thermal but poor electrical?

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Diamond and aluminum nitride are identified as materials that exhibit excellent thermal conductivity while demonstrating poor electrical conductivity. Boron nitride is also mentioned as a suitable candidate in this category. The discussion references the Wiedemann-Franz Law, which generally applies to metals. Overall, these materials are valuable in applications where thermal management is crucial without the need for electrical conduction.
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1. What are the only two materials that are good thermal conductors but poor electrical conductors? I think all metals follow the Wiedemann-Franz Law.

Diamond is, I believe, one of them.
 
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