Today I visited the Yale Law Library Rare Books Blog. Their online exhibition on the Dutch lawyer Hugo Grotius (1583-1645) and his famous book Mare Liberum triggered me to finally create this new blog. Four hundred years ago, in 1609, the first edition of this book on international law was published at Leyden. You can see the impressive selection of books that all show the huge influence of his book at the Yale Law Library Rare Books Blog. Well worth looking at, both at the blog and as a visitor to the Lilian Goldman Law Library in New Haven, Connecticut.