1. (

• Hadrian ,
• Publius_Aelius_Hadrianus ,
• Adrian ,

) Roman Emperor who was the adoptive son of Trajan; travelled throughout his empire to strengthen its frontiers and encourage learning and architecture; on a visit to Britain in 122 he ordered the construction of Hadrian's Wall (76-138) ;

2. (

• Adrian ,
• Edgar_Douglas_Adrian ,
• Baron_Adrian

) English physiologist who conducted research into the function of neurons; 1st baron of Cambridge (1889-1997) ;