Robert I. Frost was educated at the University of St Andrews, the Jagiellonian University, Cracow, and the University of London, where he wrote his doctoral thesis. He is a historian of Poland-Lithuania, who has also published on the history of Scandinavia.

• 1. Unknown Gentleman.- 2. Provenance.- 3. Resemblance.- 4. The Polish-Lithuanian Context.- 5. Portraits for the Sobieskis.- 6. Unknown Gentleman, Unknown Artist?.- 7. Who If Not Him?.

Robert I. Frost was educated at the University of St Andrews, the Jagiellonian University, Cracow, and the University of London, where he wrote his doctoral thesis. He is a historian of Poland-Lithuania, who has also published on the history of Scandinavia.

• 1. Unknown Gentleman.- 2. Provenance.- 3. Resemblance.- 4. The Polish-Lithuanian Context.- 5. Portraits for the Sobieskis.- 6. Unknown Gentleman, Unknown Artist?.- 7. Who If Not Him?.

Robert I. Frost was educated at the University of St Andrews, the Jagiellonian University, Cracow, and the University of London, where he wrote his doctoral thesis. He is a historian of Poland-Lithuania, who has also published on the history of Scandinavia.

• 1. Unknown Gentleman.- 2. Provenance.- 3. Resemblance.- 4. The Polish-Lithuanian Context.- 5. Portraits for the Sobieskis.- 6. Unknown Gentleman, Unknown Artist?.- 7. Who If Not Him?.