Firstly, the Hessian Line refers to the road that runs between Clementsvale and Bear River, Annapolis Co., N.S., along which land grants were given to disbanded (primarily) Hessian soldiers in 1784 in the newly created Clements Township. Your Rosencrantz ancestor (Johann Rosencrantz) was one of those soldiers, although he was not of a Hessian regiment but perhaps of a Kassel one.[Ref: J. Merz, The Hessians of Nova Scotia] He received Lot #24, 100 acres, on the Hessian Line.

From Wayne Walker's Annapolis & Digby County Marriage Abstracts, his marriage:
104. Married 12 Dec 1803 at Clements, John ROSENCRANS, AND, Mary APT, both of Clements. (Digby Trinity Anglican Parish Register, p.21) (IGI: 1988 extraction)

John & Mary had a number of children, including John Rosencrantz b. abt 1806:
892. Married 5 Sep 1830 in Clements, by banns, by Rev. John MILLIDGE of Annapolis, John ROSENCRANTZ of the Parish of Clements, AND, Susan PECK of the Parish of Clements.(Annapolis, St. Luke’s Parish, Register of Marriages, page 78, no. 234)[Walker]

This John would marry twice more, and have children by them both:
2152. Married 28 Jun 1855. Bond and cover dated 3 Jul 1855, by Rev. GODFREY of Clements, between John ROSENCRANTZ, widower, farmer of Greenland Settlement, Clements Township,
AND, Ann BEELER, widow. Cosigner: Frederick BEELER of same township. (Annapolis County Marriage Bonds and Licences 1855, no. 70) John ROSENCRANTZ of the Parish of
Clements, AND, Mrs. Jacob BEELER of the Parish of Clements were married 28 Jun 1855 at J.F. BEELER's house by license; witnesses: Samuel BERRY and wife, Fred BEELER and wife
(St. Clements Anglican, Marriage Register, page 37, no. 110)
[Note: She was born Frances Ann HALLIDAY], and;

St Edwards Anglican Marriages 1841-1911 (Clementsport), p56, #167: Joseph [sic] ROSENCRANTZ, Parish of Clements, widower, & Lydia PINE, Parish of Clements, widow, married at Greenland school house, 15 Sep 1864 by W. M. Godfrey.
[Note: She was born Lydia APT]

John b ca 1803 moved back to the Greenland Road prior to his second marriage. It is a road south of and parallel to the Hessian Line.

John & Susan appear in the 1838 Clements Township census (on the Hessian Line) with 2 males under age 6, one male 6-14, and one female 6-14 in their household in addition to themselves. One of those males would be the John who married Elizabeth TOWNSEND, and one the William Henry who m(1)Lydia (I believe she was a CRESS) & m(2) Rebecca MILNER.

Is the Ellen Rosencrantz you refer to the Eleanor, dau of John & Mary Rosencrantz, of Clements, farmer, bapt 8 Jun 1828 in St. Luke's Anglican Baptisms, 1817-1833, p 72, #569?

Lois Jenkins
Annapolis Royal, N.S.