Tortoise's response may be interesting but it's delusory. Christianity had spread to Great Britain long before English Common Law was set down in writing. Quickening, or the moment the mother can first feel fetal movement, was part of ancient Judaic and other near east laws as the moment after which the fetus was treated as an individual. In English Common Law, then, abortion post-quickening was ruled homicide.
Quickening, today, also refers to the first audible fetal heart beat.