"From the loggia, with its vanishing frescoes, I looked down an avenue barred by a ladder of cypress-shadows to the ducal escutcheon and mutilated vases of the gate."[1]
A ducal escutcheon is flat piece of metal adorned with a Duke's coat of arms. This coat of arms may include pictograms or letters as visual signifiers of the Duke's family.[2]
[1] Wharton 1901, p. 2
[2] Hornby 2019, Nr. 1 & 2