The revisionists contend that the country un-
derwent a major transformation through the centu-
ries of contact with Rome, culminating in conver-
sion  to  Christianity  and  the  consequent  intro-
duction of literacy. In this scenario the Iron Age is
seen  as  a  depressed  period  when  agricultural  and
pasture lands contracted, as shown by an increase of
tree pollen in several pollen diagrams from different
parts of  Ireland. This contraction began in about
the seventh century 
B.C., perhaps intensified around
200 
B.C., and continued until about the third centu-
ry 
A.D.,  when  woodland  clearance  recommenced.
This renewed clearance has been attributed to the
introduction of the plow with iron share and coulter
and of dairying, through contact with Roman Brit-
ain. It is thought that productivity of both tillage
and livestock thus improved considerably, which in-
creased the wealth of the upper classes and enabled
them to invest in clients and to buy slaves. In this
way, so the hypothesis has it, the rural economy and
society that were so well documented in the early
medieval period were triggered by innovations from
the Roman world.
We have no satisfactory dating for the appear-
ance of the iron share and coulter, however, and the
introduction of dairying is the subject of controver-
sy. Pam Crabtree has argued that the mortality pat-
tern of cattle bones from Knockaulin, probably dat-
ing to the first century 
B.C. or the first century A.D.,
is consistent with dairying. Finbar McCormick dis-
puted this analysis and went on to propose the hy-
pothesis  that  dairying  was  introduced  through
Roman contacts (i.e., later than the Knockaulin as-
semblage). In addition, he argued that ringforts—
those typical enclosed homesteads of the earlier me-
dieval period—were developed specifically to pro-
vide  protection  for  valuable  dairy  cattle.  Milk
residues  have  been  identified,  however,  in  British
prehistoric pottery. Since this pottery is as old as the
Neolithic (fourth through third millennia 
B.C.), it is
plausible to propose that dairying was introduced to
nearby Ireland in prehistoric times. Clearly, this de-
bate will continue.
The  nativist  and  revisionist  positions  are  not
completely incompatible: the former does not deny
that the conversion to Christianity promoted sub-
stantial changes in Irish society, nor does the latter
deny some continuity from Iron Age to early Chris-
tian Ireland (e.g., La Tène art). As archaeological
evidence  gradually  accrues,  and  textual  analysis  is
pursued, interpretations will improve.
See also Milk, Wool, and Traction: Secondary Animal
Products (vol. 1, part 4); Trackways and Dugouts
(vol. 1, part 4); Bronze Age Britain and Ireland
(vol. 2, part 5); Irish Bronze Age Goldwork (vol. 2,
part 5); La Tène Art (vol. 2, part 6); Irish Royal
Sites (vol. 2, part 6); Early Christian Ireland (vol. 2,
part 7); Raths, Crannogs, and Cashels (vol. 2, part
7).
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