data.doges              Load data into the environment
doge.families           Load the list of families that became doges,
                        and their numbers
doges.marriages.sn      Data on doges' (and parents) matrimonial links
doges.years             Sub-dataset with the list of doges, their
                        family and when it happened.
family.colors           Pre-assigned colors for every type of family
family.types            Load data for Venetian family types into the
                        environment
marriage.graph          Data on doges' matrimonial links
marriage.graph.slice    Data on doges' matrimonial links
