Dukes | Titles by Rank
- Dukes of Salerno
- Dukes of Salsa
- Dukes of San Carlos
- Dukes of San Cesareo
- Dukes of San Fernando de Quiroga
- Dukes of San Fernando Luis
- Dukes of San Gemini
- Dukes of San Germán
- Dukes of San Giovanni
- Dukes of San Giovanni Rotondo
- Dukes of San Juan
- Dukes of San Lorenzo
- Dukes of San Lorenzo de Valhermoso
- Dukes of San Marco
- Dukes of San Miguel
- Dukes of San Miguel
- Dukes of San Pedro de Galatino
- Dukes of San Pietro in Galatina-I
- Dukes of San Pietro in Galatina-II
- Dukes of San Ricardo
- Dukes of San Teodoro
- Dukes of San Vito
- Dukes of Sangro
- Dukes of Sanlúcar la Mayor
- Dukes of Santa Cristina
- Dukes of Santa Cristina
- Dukes of Santa Cruz
- Dukes of Santa Elena
- Dukes of Santa Fe
- Dukes of Santa Isabel
- Dukes of Santa Lucia
- Dukes of Santa Lucia
- Dukes of Santangelo
- Dukes of Santisteban del Puerto
- Dukes of Santo Buono
- Dukes of Santo Mauro
- Dukes of Santoña
- Dukes of Saponara
- Dukes of Sarno
- Dukes of Sartirana
- Dukes of Sasso Ruffo
- Dukes of Savoy
- Dukes of Saxe
- Dukes of Saxe-Altenburg
- Dukes of Saxe-Barby
- Dukes of Saxe-Bergedorf
- Dukes of Saxe-Coburg
- Dukes of Saxe-Coburg-Eisenach
- Dukes of Saxe-Coburg-Gotha
- Dukes of Saxe-Coburg-Saalfeld