115325
The structure was the third in a series of three large wrought iron bridges built in the middle of the nineteenth century and was influenced by the preceding two , both of which had been designed by Robert Stephenson .
 Robert Stephenson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Robert Stephenson