what are all the dukedoms?
duke of abrantes, duke of albuquerque, duke of aveiro, duke of avila and bolama, duke of barcelos, duke of beja, duke of braganza, duke of cadaval, duke of caminha, duke of coimbra, duke of faial, duke of ficalho, duke of goa, duke of guarda, duke of guimaraes, duke of lafoes, duke of linhares, duke of loule, duke of miranda do corvo, duke of palmela, duke of porto, duke of saldanha, duke of tancos, duke of terceira, duke of torres novas, duke of trancoso, duke of vila real, duke of viseu, duke of vitoria
which two share the same date of creation?
duke of coimbra, duke of viseu
of these, which is not the duke of coimbra?
duke of viseu