In Sax-on and old English law. Castle work. Serv-ice and labor done by Inferior tenants for the bulldlng and upholding castles and pub-lic places of defense, one of the three *nec-essary charges, (trinoda ncccssitas.) to which all lands among the Saxons were expressly subject Cowell
Source: Black's Law Dictionary 2nd Ed (1910)
