Disambiguation: Timothy Alsop, son of Rev. John Alsop, husband of Martha, brother of Josias and Mrs. Elizabeth Rossiter, is not to be confused with Gateway Ancestor Timothy Alsop, (this profile) (son of John Alsop and Temperance Gilbert), and husband of Elizabeth Heires and brother of Mrs. Elizabeth Baldwin and Fowler.
Timothy Alsop, is the son of John Alsop, Gent. of Alsop-le-Dale (in Ashbbourne) and Thorpe, Deberbyshire, (son and heir of Anthony Alsop, Esq. of Alsop-le-Dale and his wife Jane daughter of Richard Smith), and the wife of John Alsop - Temperance Gilbert, daughter of William Gilbert and Anne Clere. 
Timothy married Elizabeth Heires.  They had two sons who died without issue. 
Timothy immigrated to New England before 1644, where he settled at New Haven, Connecticut. 
Timothy is brother to Gateway Ancestors George Alsop (died Milford, Connecticut 1679), and to Mrs. Elizabeth Baldwin and Fowler (living in Milford, Connecticut Nov. 1670). 
Timothy is thought to have returned to England. 
↑Magna Carta Ancestry: A Study in Colonial and Medieval Families