Thirty-three manuscripts preserve the complete text of Plato’s Laches. Three of them, Vindobonensis Suppl. gr. 7 (siglum W), Lobcovicianus (Roudnice VI Fa 1; siglum L) and Vaticanus graecus 1029 (R), belong to the same family, i.e. the third family. Despite previous discussion, today the date of the most ancient section of W is assigned to saec. XI. The independence of this manuscript in the first seven tetralogies was stated for the first time by Josef Král in 18921 and the other manuscripts of its family derive – directly or indirectly – from it. This paper will give an overview of the extant manuscripts of the third family and investigate the mutual relationships between them, as they result from the collation of all thirty-three manuscripts of the Laches.