In Old Norse, the weak preterite had distinct forms for the 1sg. and 3sg.: ek sagða "I said" vs. hann sagði "he said" In modern Icelandic, the same verb form is used for both persons (ég/hann sagði). At what point are these two forms thought to have merged? Could the merger have been due to analogy with the strong preterite, in which I think the 1/3sg. have historically been the same (as in, for ex., ON ek/hann naut "I/he enjoyed", ek/hann dreif "I/he drove")?