William Lyon, 1475–
- Name
 - William /Lyon/
 - Given names
 - William
 - Surname
 - Lyon
 
| Death of a mother | Elizabeth Dennis Berkeley 1470 (aged )  | 
|---|---|
| Birth |  1475 
33 | 
| Death of a brother | John Lyon April 8, 1528 (aged 53 years)  | 
| Death of a brother | John Lyon October 3, 1592 (aged 117 years)  | 
| mother | 
                        
 
        1442–1470     
    Birth: 1442 — Berkeley, Gloucestershire, England Death: 1470 — England          | 
                
|---|---|
| elder brother | |
| 
                                                    
                        
                                                     
                                                                
                                                                                                    6 years                                                             
                        
                        himself                     | 
                    |
| brother |