In response to Ulster Alexander's post at 03:51 regarding "...a Dr. William and Mary (McAllister) Church settled in Lancaster County. This Dr. William Church was born about 1772 in Londonderry, and "Encyclopedia of Pennsylvania biography: illustrated," Volume 2, by John Woolf Jordan; Thomas Lynch Montgomery; et al states that this Dr. William Church was the son of Sir William Church.", while looking for clues to my own Church ancestors, I found the following which may serve for further research regarding William born in 1772.
228 THE SCOTCH-IRISH IN AMERICA.
Dake, Mrs. Elizabeth Church, 216 Yine Street, Nashville, Tenm First year.
Born at Pittsburg, Pa. ; father, Dr. William Church, a leading physician of Pittsburg, Pa., was born at Coleraine, Ireland; mother, Elizabeth Taggart Church, born in North Ireland; wife of Dr. J. P. Dake, and mother of five children ; Manager of Protestant Orphan Asylum, and of the Woman's Mission Home, Nashville, Tenn.
Dake, Dr. William Church, 218 North Yine Street, Nashville, Tenn. 1892.
Born in Pittsburg, Pa., January 28, 1852; became a resident of [continued on next page...LIST OP MEMBERS. 229] Nashville, Term., June 22, 18G9; eldest son of Dr. J. P. and Elizabeth Church Dake; mother horn in Pittsburg, Pa., August 19, 1S26; mother's father, Dr. William Church, Jr., born in Coleraine, Ireland, August 1, 1795; mother's mother, Elizabeth Taggart Church, born in County Down, Ireland, December, 1795; mother's grandfather, Dr. William Church, Sr., born in Coleraine, Ireland, August 19, 1772; mother's grandmother, Margaret McAllister Church, born in Ireland in 1770; mother's grandparents came to America in 1797, and settled in Strasburg, Lancaster County, Pa.; removed to Pittsburg, Pa., in 1805; physician; President (1S92- 93) Southern Homeopathic Medical Association; President (1891- 93) Homeopathic Medical Society of Tennessee; member American Institute of Homeopathy, and of American Obstetrical Society.
Source:
http://www.ebooksread.com/authors-eng/scotch-irish-congress/the-scotch-irish-in-america--proceedings-of-the-scotch-irish-congress-toc/page-22-the-scotch-irish-in-america--proceedings-of-the-scotch-irish-congress-toc.shtml