First one has really deep roots in Daito-ryu despite performed in a different way. I saw it few times however had no chance to ask about teacher it cames from. Anybody aware of it?
I'm pretty sure I've seen footage of Morihei Ueshiba O-Sensei performing that one. It seems to be pretty popular amongst a bunch of different aikido lineages. Most aikido groups categorize it as a "kokyuunage" (O-Sensei wasn't great about preserving names, so a bunch of barely related techniques get called that), but you can find it in Daito-ryu's Aiki-no-jutsu set under the name "kagigatame" (meaning "key hold-down"). Exact form in aikido tends to vary a little bit by practitioner, and by the size difference between the two training partners.