"John4 Rowley … m. (1) Sept. 11, 1716, Deborah Fuller, who was perhaps dau. of John and Mehitabel (Rowley) Fuller, of Barnstable and East Haddam. If so, she was not, though living, named by her father in his will."
"Rowley, … John, m. Deborah Fuller, Sept. 11, 1716 [LR1:571]"
The lack of mention of her in the will of John4 Fuller casts some doubt on his daughter being the wife of John4 Rowley. However, the scarcity of women by the name of Deborah Fuller available for this marriage render the identification highly probable.