Today we will look at the form वैदेह्या fIs from रघुवंशम् verse 12-20.

रामोऽपि सह वैदेह्या वने वन्येन वर्तयन् ।
चचार सानुजः शान्तो वृद्धेक्ष्वाकुव्रतं युवा ॥ 12-20 ॥

टीका –
सानुजः शान्तः रामोऽपि वैदेह्या सह वने वन्येन वनभवेन कन्दमूलादिना वर्तयन् वृत्तिं कुर्वञ्जीवन् वृद्धेक्ष्वाकूणां व्रतं वनवासात्मकं [वृद्धेक्ष्वाकुव्रतं ] युवा यौवनस्थ एव चचार ।।

Translation – Rāma, too with Sītā, sustaining there in the forest on forest-food, took up with his younger brother, with a mind becalmed even while in youth, the vows that bind the Ikṣvākus in their old age (20).

The above verse has been discussed in detail in the Thursday class on September 8, 2011 –  Video

The above verses have previously appeared in the following post – वैदेह्या-fis

विदेहा जनपदः, विदेहो नाम क्षत्रियः। विदेहस्यापत्यम् (स्त्री) = वैदेही – a (female) descendant of a kṣatriya king named Videha, which is also the name of his territory. It refers to Sītā, daughter of Videha (king Janaka).
In the verses the विवक्षा is तृतीया-एकवचनम्। Hence the form is वैदेह्या।

(1) विदेह ङस् + अञ् । By 4-1-168 जनपदशब्दात्‌ क्षत्रियादञ् – To denote the sense of अपत्यम् (descendant) the तद्धित: affix ‘अञ्’ may be applied optionally following a syntactically related पदम् which ends in a sixth case affix and has as its base a word that denotes the name of a kṣatriya king, as well as the name of his country/territory.
As per the सूत्रम् 4-1-92 तस्यापत्यम् – Following a syntactically related पदम् in which the सन्धिः operations have been performed and which ends in a sixth case affix the तद्धिता: affixes already prescribed (by the prior rules 4-1-83 प्राग्दीव्यतोऽण् etc), as well as those that are going to be prescribed (by the following rules 4-1-95 अत इञ् etc), may be optionally applied to denote the sense of अपत्यम् (descendant.)
Note: The affix ‘अञ्’ over-rules the default affix ‘अण्’ (prescribed by 4-1-83 प्राग्दीव्यतोऽण्) as well as the affix ‘इञ्’ (prescribed by 4-1-95 अत इञ्)।

(2) विदेह ङस् + अ । अनुबन्ध-लोपः by 1-3-3 हलन्त्यम्, 1-3-9 तस्य लोपः।
Note: ‘विदेह ङस् + अ’ gets the designation प्रातिपदिकम्‌ by 1-2-46 कृत्तद्धितसमासाश्च। This allows 2-4-71 सुपो धातुप्रातिपदिकयोः to apply in the next step.

(3) विदेह + अ । By 2-4-71 सुपो धातुप्रातिपदिकयोः – A सुँप् affix takes a लुक् elision when it is a part of a धातुः or a प्रातिपदिकम्।

Note: The affix ‘अञ्’ is a ञित् (has the letter ‘ञ्’ as इत्)। This allows 7-2-117 तद्धितेष्वचामादेः to apply in the next step.

(4) वैदेह + अ । By 7-2-117 तद्धितेष्वचामादेः – The first vowel among the vowels of a अङ्गम् which is followed by a तद्धित: affix (ref. 4-1-76 तद्धिताः) which is either a ञित् (has the letter ‘ञ्’ as a इत्) or a णित् (has the letter ‘ण्’ as a इत्) takes the वृद्धि: (ref. 1-1-1 वृद्धिरादैच्) substitute.
Note: The अङ्गम् ‘वैदेह’ gets the भ-सञ्ज्ञा by 1-4-18 यचि भम् which allows 6-4-148 यस्येति च to apply in the next step.

(5) वैदेह् + अ । By 6-4-148 यस्येति च – When the letter ‘ई’ or a ‘तद्धित’ affix follows, the (ending) इ-वर्ण: (letter ‘इ’ or ‘ई’) or the (ending) अवर्ण: (letter ‘अ’ or ‘आ’) of the अङ्गम् with the भ-सञ्ज्ञा takes elision (लोपः)।

= वैदेह ।

Now we form the feminine प्रातिपदिकम् ‘वैदेही’ as follows –

(6) वैदेह + ङीप् । By 4-1-15 टिड्ढाणञ्द्वयसज्दघ्नञ्मात्रच्तयप्ठक्ठञ्कञ्क्वरपः – To denote the feminine gender, the affix ङीप् is used following a प्रातिपदिकम् which satisfies the following conditions:
(i) the प्रातिपदिकम् ends in the letter ‘अ’ and
(ii) the प्रातिपदिकम् ends in a non-secondary affix which is either टित् (has the letter ‘ट्’ as a इत्) or is one of the following – ‘ढ’, ‘अण्’, ‘अञ्’, ‘द्वयसच्’, ‘दघ्नच्’, ‘मात्रच्’, ‘तयप्’, ‘ठक्’, ‘ठञ्’, ‘कञ्’ or ‘क्वरप्’।

(7) वैदेह + ई । अनुबन्ध-लोपः by 1-3-3 हलन्त्यम्, 1-3-8 लशक्वतद्धिते and 1-3-9 तस्य लोपः।
Note: The अङ्गम् ‘वैदेह’ has the भ-सञ्ज्ञा here as per the सूत्रम् 1-4-18 यचि भम्। This allows the सूत्रम् 6-4-148 to apply in the next step.

(8) वैदेह् + ई । By 6-4-148 यस्येति च – When the letter ‘ई’ or a ‘तद्धित’ affix follows, the (ending) इ-वर्ण: (letter ‘इ’ or ‘ई’) or the (ending) अवर्ण: (letter ‘अ’ or ‘आ’) of a अङ्गम् with the भ-सञ्ज्ञा takes elision (लोपः)।

= वैदेही । The प्रातिपदिकम् ‘वैदेही’ declines like नदी-शब्दः।

Similarly, we can derive the following –
१) पञ्चाला जनपदः, पञ्चालो नाम क्षत्रियः। पञ्चालस्यापत्यम् (स्त्री) = पाञ्चाली – a (female) descendant of a kṣatriya king named Pañcāla, which is also the name of his territory. It generally refers to Draupadī.