John R. Jackson Baylis was born on 8 Dec 1843 at Lockport, Niagara Co., NY, son of Ira and Jane R. French Baylis. As of 1860, he was also known as Jackson "Jack" Baylis is seen as Jackson in 1860 and John R. in 1880 and 1900 census records. He lived on 31 Aug 1862 at 250 North Transit Street, Lockport, NY; 68 Saxton, Lockport, NY. John, a twin was born before Jefferson.

Civil War: General Index, Ref. Card, NY, M551, Cab 43, Roll #5:
John R. Bailis, Co. H and E, 49th NY Vol.Inf., original filed Baylis, entered Private and was promoted to Corporal. Both John and his twin Jefferson enlisted at age 16.
REF: Record and Pension Office, War Dept. Ctg. No. 595,559: Co.H Reg't NY Vol. Inf. enrolled 16 Aug. 1861 and mustered out 27 June 1865 with Co.s E, Batt'n 49 NY, near Washington, DC.
Co.H commanded by Capt. Charles H. Mass. Inf. to which transf'd.
Re-enlisted 25 Dec. '63. Also known as "Bayliss". He held the rank of Pvt. from enroll't to Mch-1863, Corprl. to Muster Out.
Rolls show him present except as follows:
Aug. 31/62, left sick at Alexandria, VA, Aug. 29/62
From Sept. 1 to Dec.31/62, abs't sick in s&vcp.? at Annapolis Junction since Aug. 29/62.
Dec. 31/62, on furlough for 35 days from Dec. 3 of 63. (Vet. furlough.)
Aug. 31/64, abs't sick at City Point, VA, since July 9/64

Medical records show him treated as follows:
Aug. 30/62 to Dec 29/62 Gastritis Acute. returned to duty:
As J.R. Balis &c Dec. 30/62 (No diagnosis);
As John R. Baylis, Corpl &c July to Aug. 13/64 Int. fever;
As John R. Bayles Corpl Aug. 14 to Sept. 24/64 Remittial Fever returned to duty. Nothing additional found.

Personal description: Age 18, height 5 ft., 8 in., complexion Light, eyes Grey, hair dark, occup. Miller, age at Reeenl. also shown as 20 years. Declaration for an Original Invalid Pension: John was taken sick July 1864 in front of Petersburg, VA.; in the summer of 1862 at Harrison's Landing, VA was taken sick

He married Jane "Jennie" McMaster, daughter of William McMaster and Isabelle Totten, on 26 Apr 1866 at Lockport, Niagara Co., NY; married by Rev. Joseph S. Bennett.
Death Certificate shows:
Cause of Death: acute dilatation of heart (Angina pectoris), Contributory: chronic myocarditis arterial sclerosis, duration 5 or 6 years.
Occp: Court Crier
Employer: Niagara County
Father: Ira Baylis born in Vermont
Mother: Jane French born Vermont
Informant: Albert S. Baylis, Pine St., Lockport, NY
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He appeared on the census of 1880 at Lockport, Niagara Co., NY:
John R. Baylis, Self, M, Male, W, 34, b. NY, Farmer, F b. NY, M b. NY
Jennie BAYLIS, Wife, M, Female, W, 29, b. NY, Keeping House, F b. NY, M b. NY
Minnie BAYLIS, Dau, S, Female, W, 13, b. NY
May BAYLIS, Dau, S, Female, W, 12, b. NY
Jennie BAYLIS, Dau, S, Female, W, 10, b. NY
Lydia B. BAYLIS, Dau, S, Female, W, 7, b. NY
Ira J. BAYLIS, Son, S, Male, W, 5, b. NY
Albert BAYLIS, Son, S, Male, W, 3, b. NY
Eugene BAYLIS, Son, S, Male, W, 1, b. NY