1.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

John CELLARD (sic) Spouse: Cornelia Jane CELLARD (sic) Marriage: 01 Jul 1856, Delaware, Ohio Source: Marriage Records, 1835-1951. Ohio. Probate Court (Delaware County)

This would have been the date the license was procured, not necessarily the date of the ceremony.

2.  1860 Census Index/Images (online at Genealogy.com; Image #25 of 30):  Dublin P.O. (Franklin Co., OH), Liberty Twp., Delaware Co., OH, Roll 957 (Book 1), p. 227A, PN 25, enumerated 9 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤•

181	187	Jno Celler	40	M		Farmer	3470	225	O
		Cornelia	39	F					"
		Frances	1	F					"
	188	Thos A Celler	44	M		Do	3470		"
		Hannah	41	F			3470		"
		Lucy A Smiley	4	F					"

Thomas and Hannah are John's siblings.  They have obviously come into an inheritance, presumably from their father who died in 1854.

3.  1870 Census Index/Images (online at Genealogy.com, Image #7-8 of 36):  Constantia P.O., Liberty Twp., Delaware Co., OH, Roll 1196 (Book 1), pp. 393A-393B, PN 7-8, 55/53, enumerated 7 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Cellar John	50	M	W	Farmer	14,000	620	Ohio
______ Cornelia	39	F	W	House Keeper			"
______ Francis A	11	F	W	At School			"
[next page]
Cellar Sarah	9	F	W				Ohio
______ Edward	4	M	W				"
Cellar ______	1	F	W				"
______ Thomas A	54	M	W	Farmer		400	"
______ Hannah	52	F	W	Without Occ.			"
Smiley Lucy A	15	F	W	At School			"

4.  1880 Census (indexed at FamilySearch.org; page image online at Ancestry.com, Image #12 of 31):  Liberty Twp., Delaware Co., OH, p. 309D, PN 12, SD 5, ED 104, enumerated 10 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):¤•

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

8

9

10

13

21

24

25

26

108

110

Cellar John

W

M

60

/

Farmer

OH

PA

MD

______ Cornelia J

W

F

49

Wife

/

Keeping House

OH

PA

NY

______ Francis A

W

F

21

Dau

/

OH

OH

OH

______ Sarah

W

F

19

Dau

/

/

OH

OH

OH

______ Edward

W

M

13

Son

/

At school

/

OH

OH

OH

______ Mary E

W

F

11

Dau

/

At school

/

OH

OH

OH

______ Henry

W

M

7

Son

/

At home

OH

OH

OH

______ Thomas A

W

M

64

Bro

/

Farmer

OH

PA

MD

______ Hannah

W

F

62

Sis

/

OH

PA

MD

Listed two households from John's first cousin, John G. F. CELLAR, who is three households from John G.F.'s sister, Lucy (CELLAR) KNAPP. 

5.  Anon.  1880.  History of Delaware County and Ohio.  O.L. Baskin, Chicago (online at Heritage Pursuit):

p. 656

LIBERTY TOWNSHIP... CAPT. JOHN CELLAR, farmer; P.O. Powell; he is the third child of a family of five children; his father, Thomas Cellar, was born in Franklin Co., Penn., Jan. 19, 1784; and his wife's name before marriage was Margaret Gabrile, a native of Maryland; the Cellar family emigrated to this State in 1800 and first located in Franklin Co. and, in the year 1802, made their way up the river Olentangy in a keel-boat and settled about one mile north of Liberty Church, on the west bank of the Olentangy, where they built a rude cabin in which they lived until they could afford better; John's grandfather was a gunsmith, and the Indians came from Sandusky to get their guns repaired by him; Chillicothe was the principal trading-point at that time and where they got their milling done; Thomas Cellar died June 11, 1854; his wife Nov. 4, 1827; they were married Jan. 10, 1815.  John Cellar was born on the place where he now resides, April 23, 1820.  July 3, 1856, he was married to Cornelia Cellar, born in this township Nov. 13, 1830; they have had eight children, but five now living -- Frances A., Sarah, Edward, Mary E. and Henry.  May 10, 1864, he went out as Captain of Co. A, 146th O. N. G., in the 100-days service, and served his time in and about Forts Smith, Tillinghast and Woodbury, near Washington City; was mustered out Aug. 24, 1864, at Camp Chase, and returned home to farming pursuits.  Himself and wife are members of the Presbyterian Church; he also holds the office as Township Clerk.

It was Co. K, 145th Regiment.  "O.N.G." = Ohio National Guard, more commonly known as the "O.V.I.," Ohio Volunteer Infantry.

6.  American Civil War Soldiers (online at Ancestry.com; missing columns contained no data):

Name	Age	Rank	Unit	Enlist Date	Date/Place Mustered Out
John Cellar	44	Capt	Co. K, 145th Ohio Inf.	12 May 1864	24 Aug 1864, Camp Chase, OH

7.  Civil War Pension Index (index and images online at Ancestry.com):

Name of Soldier	Cellar, John
Name of Dependent	Widow	Cellar, Cornelia J.
	Minor
Service	K 145 Ohio Inf.
Date of Filing	Claim	Application No.	Certificate No.	State from which Filed
1890 Dec 13	Invalid	1003905	646273	Ohio
1898 Oct 12	Widow	683864	471315	Ohio
	Minor

The image was blurry and hard to read; I may not have gotten the dates or numbers correct.