Sir Christopher Sibthorp

Can any of your readers furnish me with information as to the ancestry of Sir Christopher Sibthorp, whose name appears in the title-page of the following tract: *A friendly Advertisement to the pretended Catholics of Ireland, by Christopher Sibthorp, Knt., one of H.M. Justices of his Court of Chief Place in Ireland*, 1622, Dublin and also as to the crest, arms, and motto borne by him.