(A title with no vassal baronies obviously has no development to be passed up the chain.)
The Empire of the Alps, Duchy of Tuscany, and County of Siena (1281 CE)
Holder: Ioulianos Argyros (Orthodox, Greek)
Capital: Castello di Brolio (1 + 6 + 4 + 21 + __ under the Alps = 32+ development)
The Castle of Castelnuovo Berardenga
The City of Montalcino
The Castle of Montepulciano
The Castle of Monteriggioni
The Temple of Pienza
The City of Siena
The County of Arezzo
Holder: Ioustinos of Finèl (Orthodox, Greek)
Capital: Città di Castello (1 + 3 − 1 = 3 development)
The City of Arezzo
The Temple of Castello di Monteguarco
The City of Cortona
The County of Florence
Holder: —
Capital: Castrum Prati (1 + 4 − 1 = 4 development)
The City of Castellina
The Temple of Fiesole
The City of Firenze
The Castle of Spedale di San Michele Archange
The County of Grosseto
Holder: —
Capital: Castello di Monteregio (1 + 2 − 1 = 2 development)
The City of Grosseto
The Temple of Roselle
The County of Santa Fiora
Holder: —
Capital: Arcidosso (1 + 5 − 1 = 5 development)
The City of Orbetello
The City of Pitigliano
The City of Santa Fiora
The Castle of Soana
The Temple of Sorano
The Duchy of Baden and County of Breisgau
The County of Bologna
The Duchy of Carinthia and County of Carinthia
The Duchy of Como and County of Castelseprio
The Duchy of Ferrara and County of Ferrara
The Duchy of Istria and County of Duino
The Duchy of Lucca and County of Volterra
The Duchy of Mantua and County of Novellara
The Duchy of Marche and County of Ancona
The Duchy of Milan and County of Milan
The Duchy of Modena and County of Reggio
The Duchy of Montferrat and County of Montferrat
The Castle of Oderso
The Duchy of Parma and County of Piacenza
The Duchy of Piedmont and County of Susa
The Duchy of Pisa and County of Pisa
The Duchy of Ravenna and County of Forli
The Duchy of Savona and County of Savona
The Duchy of Siena
Holder: —
Capital: —
The Duchy of Spoleto and County of Spoleto
The Duchy of Urbino and County of Urbino
The Duchy of Verona and County of Vicenza