The age difference between Henry and Martha make it a near certainty that he had an earlier wife.

Because we don't know the date for Henry's marriage to Martha, there's considerable uncertainty as to which wife birthed which children.

Martha is old enough to be William's mother, but it's a stretch for her to be the elder boy's mother, but the fact that these are among the children Henry brought with him to Ohio suggests they may, indeed, both be Martha's.  If Henry's first wife was Catherine FOX, then see her family group sheet for additional children by her. 

1.  Marriage Record:

2.  Census Index:  Colonial America, 1607-1789 (Broderbund CD-310):  not found.

3.  Census Index:  U.S. Selected Counties, 1790 (Broderbund CD-311):  the only Henry STROPE indexed in the census is the one in Luzerne [now Bradford] Co., PA, who married Catherine FOX.

2.  Census Index:  U.S. Selected Counties, 1800 (Broderbund CD-312):  the only Henry STROPE indexed in the census (mis-indexed as Henry STRIPE) is the one in Luzerne [now Bradford] Co., PA, who married Catherine FOX.

3.  1820 Census Index and Digital Images (online at Ancestry.com; Image #1 of 2; extracted by Diana Gale Matthiesen):¤•

1820

OH

Clark Co.

Springfield Twp.

p. 11

Ln. 25

Henry Strope

410101-01010-0-100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
4 males	9 or under	1810-1820	= Son C = Perry (b. 1816/7) = Washington (b. 1813/4) = Son B
1 male	10-15	1804-1810	= William (b. 1805)
1 male	19-25*	1794-1801	= Son A
1 male	45 or over	in or bef. 1775	= Henry (b. 1765/6)
1 female	10-15	1804-1810	= Daughter A
1 female	26-44	1775-1794	= Martha (b. 1784/5)
1	person engaged in agriculture
*In the 1820 Census, the third column is age class 16-18 and the fourth column is age class 16-25; therefore, any individual in column three is duplicated in column four.  By subtracting the number in column three from the number in column four, you can create an age class "19-25."

4.  1830 Census Index/Images (online at Ancestry.com; Image #7 of 18; extracted by Diana Gale Matthiesen):¤•

1830

OH

Ross Co.

Deerfield Twp.

p. 230

Ln. 10

Henry Strope

012 200 010 - 010 100 100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	5-9	1820-1825	= Ward (b. 1821/2)
2 males	10-14	1815-1820	= Son E = Perry (b. 1816/7)
2 males	15-19	1810-1815	= Washington (b. 1813/4) = Son C
1 male	50-59	1770-1780	= Henry (b. 1765/6)
1 female	5-9	1820-1825	= Lucinda? (b. 1821/2)
1 female	15-19	1810-1815	= Daughter A?
1 female	40-49	1780-1790	= Martha (b. 1784/5)

5.  1840 Census Index/Images (online at Ancestry.com, Image #7-8 of 16; extracted by Diana Gale Matthiesen):¤•

1840

OH

Ross Co.

Deerfield Twp.

pp. 414A-414B

Ln. 22

Henry Strope

000 100 000 100 - 000 100 010

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	15-19	1820-1825	= Ward (b. 1821/2)
1 male	70-79	1760-1770	= Henry (b. 1765/6)
1 female	15-19	1820-1825	= Lucinda? (b. 1821/2)
1 female	50-59	1780-1790	= Martha (b. 1784/5)
1	person employed in agriculture

Listed next to son, Perry STROPE. 

6a.  1850 Census Index/Images (online at Ancestry.com; Image #33-34 of 64):  Concord Twp., Ross Co., OH, pp. 169A-169B, 2474/2474, enumerated 23/24 Oct 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•

Isaac Vincent	33	M		Farmer	3700	Ohio
Lucinda   "	28	F				"
Ann E     "	6	F				"
[next page]
Jeptha A Vincent	1	M				Ohio
Charlotte T Christy	11	F				"
William Dougherty	12	M				"
Martha Stroup	65	F				Pa

Listed next to Martha's son, Perry STROPE. 

6b.  1850 Census Mortality Schedules (online at Ancestry.com):

Name	State	County	Age	Birth	Year	Month	Cause
Stroup, Henry	Ohio	Ross	84	PA	1850	Feb	Old Age

If our subject was the Henry STROPE who first married Catherine FOX, then he was born in New York, not Pennsylvania, but he grew up in Pennsylvania, so may have believed he was born there, as is often the case (i.e., children often believe the place where they grew up is where they were born, even though they may actually have been born elsewhere).  And note that the informant on this record was not Henry, himself, who was deceased, so the informant may easily have been mistaken.

7.  R.S. Dill.  1881.  History of Fayette County, together with Historic Notes on the Northwest and the State of Ohio.  Odell & Mayer, Publ., Dayton, OH (online at Genealogy.com; Borderbund CD-450):

p. 252

HENRY STROPE. July 7, 1812, witnessed the departure of Henry Strope, a native of Pennsylvania, who, accompanied by his family, consisting of his wife and nine children, crossed the Alleghanies in the "old-fashioned wagon," and arrived at Chillicothe [Ross Co., OH] on the 15th of September, remaining there until 1814, at which time they removed to this county, settling on a farm in the present limits of Marion Township, now owned by Burnett Mooney, consisting of twelve hundred acres, which was rented of Adam Turner.  During the war of 1812 he drove cattle to Fort Meigs [Perrysburg, Wood Co., OH] for the use of the American army.  He lived a quiet life, raised a large family, but accumulated little property, and died in 1848.  His son, 'Squire [William] Strope, has lived on the farm he now owns sixty-five years, was the first justice of the peace of Marion Township, and still continues in that office.

If our subject was truly born in Pennsylvania, then he was not the Henry STROPE who first married Catharine FOX.  But then, Henry was obviously not the informant for this item because he was long dead at the time it was published — and because it contains some significant errors.  The informant appears to have been Henry's son, William STROPE (1805-1881), whom the 1830-1880 censuses show living in Fayette Co., OH.  William was born in Pennsylvania, and he was just old enough to have remembered the wagon trip from Pennsylvania to Ohio.  However, either William or the author erred in saying Henry settled in Fayette County.  The censuses show Henry living in Clark County in 1820 and back in Ross County in 1830 and 1840, where he died in 1850 (not 1848).

8.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).