There are two mills on the Kings River ESE of the Kells Bridge. This is the second one, Mullin's Mill.

From kellsvillage.bravepages.com we learn the following:

"The Mullins mill has the distinction of being situated on the site of the first mill to serve the
priory in the 1170s. The mill was named after the Mullins family who took over the operations
around 1782 after another venture, a timber mill in Ennisnag, was destroyed by flooding. A flax
mill was set up adjacent to the grain mill as flax was a popular and valuable crop at the time.
However, after penal trade laws were imposed on Ireland following the Act of Union in 1800, the
flax industry collapsed and the mill fell into ruin.

The thatched cottage over the road from the mill (where we stayed) was the Mullins family home and
it was from here that they ran the mill until 1965 when the last of the Mullins, Paddy, died.
The mill operated for one more year before closing for good. It was then occupied as a residence
and was eventually bought in 1997 by the Kells Region Economic and Tourism Enterprise (KRETE) with
the intention of preserving it and developing it as a working mill, museum and arts & crafts center
The restored flax mill now houses the KRETE offices."