In which year was the first cloned mammal, Dolly, born?

Dolly, the first cloned mammal, was born on July 5th, 1996. 

She was successfully cloned by Ian Wilmut and his team of researchers at the Roslin Institute in Edinburgh, Scotland. 

Dolly was cloned from a mammary gland cell of a Finn Dorset ewe using a technique called somatic cell nuclear transfer, where the nucleus of an unfertilized egg was replaced with the nucleus from the mammary cell. 

Dolly's birth was a groundbreaking achievement in the field of genetics and reproductive biology, and it opened up new possibilities for cloning and genetic engineering.