In the series A Song of Ice and Fire, who is the founder of House Thenn?
Sigorn, son of Styr
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: In the series A Song of Ice and Fire, who is the founder of House Thenn?
### Input: 
### Response: Sigorn, son of Styr