In the person of somebody
Definition 1 of 1
Pro Tip 1/3Symbolic Representation
The phrase often indicates that a person stands for or symbolizes a larger concept or group. 
Peace was present in the person of the diplomat.
Pro Tip 2/3Not Literal
Remember that this phrase is metaphorical, not suggesting the actual transformation of one person to another. 
He brought hope in the person of the new coach.
Pro Tip 3/3Figures and Identities
It can be used when discussing key figures or identities who represent qualities or values. 
The spirit of the city was revived in the person of the newly elected mayor.